Right-of-use assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Acquisitions Goodwill recognized Goodwill, Acquired During Period Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Range [Domain] Range [Domain] Forward commitments to sell TBA securities Forward Contracts [Member] Supplemental Disclosure of Non-Cash Investing and Financing Activities Other Noncash Investing and Financing Items [Abstract] Common stock, par value Common Stock, Par or Stated Value Per Share Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Schedule of Other Expenses Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] Proceeds from loans held for sale Proceeds from Sale of Mortgage Loans Held-for-sale Term deposits Deposits, Fair Value Disclosure Identifiable assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Other Commitments Other Commitments [Line Items] Telephone Telephone Expenses Telephone expenses Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Income Statement Location [Domain] Income Statement Location [Domain] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Net interest income after provision for loan losses Interest Income (Expense), after Provision for Loan Loss Amortized Cost Debt Securities, Amortized Cost Basis This item represents the cost of available-for-sale and held-to-maturity debt securities, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Sales of available-for-sale debt securities Proceeds from Sale of Debt Securities, Available-for-sale Carrying amounts and estimated fair values of financial instruments not carried at fair value Fair Value, by Balance Sheet Grouping [Table Text Block] Loan expenses Loan-Related Expenses Loan-related expenses. Depreciation and amortization of premises and equipment Depreciation, Nonproduction Total financial assets Financial Assets Fair Value Disclosure Financial assets fair value disclosure. OREO Secured by Residential Real Estate Real Estate Acquired Through Foreclosure, Secured by Residential Real Estate Real Estate Acquired Through Foreclosure, Secured by Residential Real Estate Gain on sale of loans Gain on sale of loans Gain (Loss) on Sales of Loans, Net Pre-Tax Gains or Losses Derivative Instruments, Gain (Loss) [Line Items] Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost Due after five years through ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost Fair Value Measurement [Domain] Fair Value Measurement [Domain] Net deferred origination (fees) costs included in loans receivable Unamortized Loan Origination Fees and Costs Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases. Fair value measurement transfers from one level to another Fair Value Measurement Transfers From One Level To Another Fair Value Measurement Transfers From One Level To Another Paid-in Capital Additional Paid-in Capital [Member] Tax credit period Tax Credit Period The period in which an investor receives tax credits from a tax credit project. Held-to-Maturity, Fair Value Debt Securities, Held-to-maturity, Maturity, Fair Value, Rolling Maturity [Abstract] Debt securities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Marketable Securities Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale acquired at the acquisition date. Gain or loss on sale of investments Gain (Loss) on Investments [Abstract] Number of common stock shares issued and outstanding Balance, beginning, shares Balance, ending, shares Common Stock, Shares, Outstanding Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Transfer of loans to other real estate owned Real Estate Owned, Transfer to Real Estate Owned Amortization of investments in variable interest entities Variable Interest Entities Investment Amortization Amount of amortization expense of investment in variable interest entities. Consumer and other loans Interest and Fee Income, Loans, Other Consumer Net decrease in short-term Federal Home Loan Bank advances Proceeds from (Repayments of) Short-term Debt, Maturing in Three Months or Less Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Gross Unrealized Losses Securities, Gross Unrealized Loss Accumulated in Investments 1 Amount of accumulated unrealized loss before deducting unrealized gain on investments in available-for-sale and held-to-maturity securities impacting investments. Goodwill Net carrying value at beginning of period Net carrying value at end of period Goodwill Loans receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable Offsetting Assets [Table] Offsetting Assets [Table] Net increase in other assets Increase (Decrease) in Other Operating Assets Other borrowed funds Interest Expense, Other Mortgage-backed securities Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value Finance Lease, Present Value of Lease Payments, Short-term Finance Lease, Liability, Current Offsetting Assets [Line Items] Offsetting Assets [Line Items] Premises and equipment, net Property, Plant and Equipment, Net Level 2 Fair Value, Inputs, Level 2 [Member] Preferred shares, outstanding Preferred Stock, Shares Outstanding Total before mortgage-backed securities Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Fair Value Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Due within one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Consumer and Other Consumer Portfolio Segment [Member] Interest Rate Swaps Interest Rate Swap [Member] Statement [Table] Statement [Table] Stock-based compensation and related taxes Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition TDR With Pre Modification Loan Balance for Which Oreo Was Received TDR With Pre Modification Loan Balance for Which Oreo Was Received TDR with pre modification loan balance, for which OREO was received. Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Interest bearing deposits Interest-bearing Deposit Liabilities Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Receivables [Abstract] Receivables [Abstract] Other liabilities Other Liabilities Assets Variable Interest Entity, Consolidated, Carrying Amount, Assets Held-to-maturity Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] Interest Expense Interest Expense [Abstract] Quantitative information about assets measured at fair value on a non-recurring basis for which Level 3 inputs were used Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Gross Amounts Offset in the Statements of Financial Position Derivative Asset, Fair Value, Gross Liability Tax credits and other tax benefits recognized Affordable Housing Tax Credits and Other Tax Benefits, Amount Summary of Pre-Tax Gains or Losses Derivative Instruments, Gain (Loss) [Table Text Block] Available-for-sale Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Total lease expense Lease, Cost Retained earnings - substantially restricted Retained Earnings (Accumulated Deficit) Operating Lease, Weighted Average Discount Rate Operating Lease, Weighted Average Discount Rate, Percent 12 Months or More Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Measurement Input Type [Domain] Measurement Input Type [Domain] Other assets Other Noncurrent Assets [Member] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Held-to-Maturity, Amortized Cost Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Rolling Maturity [Abstract] Revenue from Contracts with Customers Revenue from Contract with Customer, Including Assessed Tax Amortization expense Amortization Method Qualified Affordable Housing Project Investments, Amortization Document Quarterly Report Document Quarterly Report Minimum Period Past Due to Consider Loan as Delinquent Minimum Period Past Due to Consider Loans as Delinquent Minimum Period Past Due to Consider Loans as Delinquent Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Accrued expenses and other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Liabilities ATM expenses ATM Expenses ATM Expenses Proceeds from calls of debt securities Held-to-Maturity Securities, Gross Realized Gains (Losses), Sale Proceeds The total amount of proceeds received for the sale of securities categorized as held-to-maturity during the reporting period. The sale of held-to-maturity securities includes proceeds from maturities, prepayments and calls. Interest Rate Lock Commitments Interest Rate Lock Commitments [Member] Overnight and Continuous Maturity Overnight [Member] Less than 12 Months Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Repurchase Agreements Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement Finance Lease, Financing cash flows Finance Lease, Principal Payments Finance Lease, Maturing four years through five years Finance Lease, Liability, Payments, Due in Rolling Year Five Net increase in deposits Increase (Decrease) in Deposits CDE Certified Development Entities [Member] Certified development entities. Other real estate owned Foreclosed Real Estate Expense Transfers and Servicing [Abstract] Transfers and Servicing [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Supplemental Disclosure of Cash Flow Information Supplemental Cash Flow Information [Abstract] Borrowings Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Borrowings Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Borrowings. Carrying amounts of consolidated VIEs' assets and liabilities Schedule of Variable Interest Entities [Table Text Block] Average outstanding shares - basic Weighted Average Number of Shares Outstanding, Basic Adjustments Due to New Accounting Pronouncements [Domain] Adjustments Due to New Accounting Pronouncements [Domain] Adjustments Due to New Accounting Pronouncements [Domain] Core deposit intangible, net Finite-Lived Intangible Assets, Net Loans Receivable, Net Financing Receivables [Text Block] Other assets Prepaid Expenses and Other Current Assets [Member] Operating Lease, Maturing three years through four years Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four Finance Lease, Thereafter Finance Lease, Liability, Payments, Due in Rolling after Year Five Finance Lease, Maturing one year through two years Finance Lease, Liability, Payments, Due in Rolling Year Two Securities Pledged for Repurchase Agreements Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements Amortized cost and fair value of securities by contractual maturity Investments Classified by Contractual Maturity Date [Table Text Block] Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Financial Instruments [Domain] Financial Instruments [Domain] Number of Shares Issued for Aquisition Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Accruing loans 60 to 89 days past due Financing Receivables, 60 to 89 Days Past Due [Member] Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Proceeds from bank-owned life insurance Proceeds from Life Insurance Policy Operating Lease, Present Value of Lease Payments, Long-term Operating Lease, Liability, Noncurrent Assets Assets [Abstract] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Interest Rate Swap One Interest Rate Swap One [Member] Interest rate swap. Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Range [Axis] Range [Axis] Total Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value Total interest income Interest and Dividend Income, Operating Preferred shares, authorized Preferred Stock, Shares Authorized Finance Lease, Maturing two years through three years Finance Lease, Liability, Payments, Due in Rolling Year Three Deferred tax asset Deferred Income Tax Assets, Net Core Deposit Intangible, Weighted Average Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Net interest income and non-interest income Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Business Acquisition [Axis] Business Acquisition [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable, Type [Axis] Reclassification adjustment for losses included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Document Fiscal Year Focus Document Fiscal Year Focus Sales Comparison Approach Valuation, Market Approach [Member] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Stockholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Off-balance Sheet Commitments Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability Finance Lease, Accumulated depreciation Finance Lease Right of Use Asset, Accumulated Amortization Accumulated amortization of finance lease right-of-use asset. Net of tax amount Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Other Commitments [Table] Other Commitments [Table] Cash paid during the period for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Amortization of ROU assets Finance Lease, Right-of-Use Asset, Amortization Financial liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Held-to-maturity, Unrealized Loss Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract] Measurement Input Type [Axis] Measurement Input Type [Axis] Fair Value of Assets and Liabilities Fair Value Disclosures [Text Block] Net increase (decrease) in other borrowed funds Proceeds from (Repayments of) Other Debt Mergers and Acquisitions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Accrued interest payable Accrued Interest Payable [Member] Primary financial statement caption encompassing accrued interest payable. General Business Description and Basis of Presentation [Text Block] Total fair value of consideration transferred Fair value of consideration transferred Business Combination, Consideration Transferred Entity Current Reporting Status Entity Current Reporting Status Preferred shares, issued Preferred Stock, Shares Issued Entity Emerging Growth Company Entity Emerging Growth Company Assets and Liabilities Assets and Liabilities, Lessee [Abstract] Retained Earnings Substantially Restricted Retained Earnings [Member] TDRs that Occurred During the Period, Pre-modification recorded balance Financing Receivable, Modifications, Pre-Modification Recorded Investment Summary of impaired loans Impaired Financing Receivables [Table Text Block] Due after one year through five years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Pro Forma Information Business Acquisition, Pro Forma Information [Abstract] LIHTC low Income Housing Tax Credit [Member] Low-income housing tax credit. Diluted earnings per share Earnings Per Share, Diluted Business Acquisition Business Acquisition [Line Items] Future Unfunded Contingent Commitments Other Commitments [Table Text Block] Stock issued in connection with acquisitions, shares Stock Issued During Period, Shares, Acquisitions Net unrealized gains (losses) on available-for-sale securities Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax Gross Unrealized Losses Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Gain on sale of loans Gain (Loss) on Sale of Loans [Member] Primary financial statement caption encompassing gain (loss) on sale of loans. Gross Amounts of Recognized Liabilities Derivative Liability, Fair Value, Gross Liability Gross realized losses Available-for-sale Securities, Gross Realized Losses Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Restricted stock awards and stock options excluded from the diluted average outstanding share calculation Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Checking and operating expenses Deposit-Related Expenses Deposit related expenses other than interest expense. Balance Sheet Location [Axis] Balance Sheet Location [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Business Combinations [Abstract] Business Combinations [Abstract] Corporate bonds Corporate Bond Securities [Member] Net unrealized gains on derivatives used for cash flow hedges Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax Operating Lease, Maturing one year through two years Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two Home Equity Home Equity Home Equity Line of Credit [Member] Loan based on the equity of the borrower's residential property. Includes close-ended loans in which the borrower receives the loan amount upfront and revolving, open-ended loans under a line of credit. Proceeds from redemption of non-marketable equity securities Proceeds from Sale of Federal Home Loan Bank Stock Financial Liabilities Financial Liabilities Fair Value Disclosure [Abstract] Unfunded contingent commitments Qualified Affordable Housing Project Investments, Commitment Operating Lease, Total Lease Payments Lessee, Operating Lease, Liability, Payments, Due Less than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Tax effect Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Amount of loss reclassified from OCI to net income Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Deposits Interest Expense, Deposits Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Commercial Real Estate Commercial Real Estate [Member] Minimum Period Past Due to Consider Loan as Non Accrual Minimum Period Past Due to Consider Loans as Non Accrual Minimum Period Past Due to Consider Loans as Non Accrual Entity Address, State or Province Entity Address, State or Province Net Amounts of Assets Presented in the Statements of Financial Position Derivative Asset, Fair Value, Amount Not Offset Against Collateral Occupancy and equipment Occupancy, Net Securities sold under agreements to repurchase Securities Sold under Agreements to Repurchase Number of Bank Divisions Number of Bank Divisions Number of Bank Divisions Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Derivatives and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Liabilities New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Liabilities New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Liabilities Carrying Amount Reported Value Measurement [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Loans receivable, net of ALLL Loans Receivable, Fair Value Disclosure Accounting Guidance Adopted in 2019 and Pending Adoption at September 30, 2019 New Accounting Pronouncements, Policy [Policy Text Block] Carrying Value of Repurchase Agreements Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table Text Block] Document Transition Report Document Transition Report Fair Value Total Debt Securities, Held-to-maturity, Fair Value Less than 12 Months Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Components of Lease Expense Lease, Cost [Table Text Block] Loans Receivable Finance, Loans and Leases Receivable, Policy [Policy Text Block] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Other real estate owned Other Real Estate Owned, Measurement Input Tax withholding payments for stock-based compensation Payments Related to Tax Withholding for Share-based Compensation Purchases of available-for-sale debt securities Payments to Acquire Debt Securities, Available-for-sale Summary of debt securities with an unrealized loss position Schedule of Unrealized Loss on Investments [Table Text Block] Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Non-Interest Expense Noninterest Expense [Abstract] Total before mortgage-backed securities Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Amortized Cost Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost Class of Financing Receivable [Domain] Class of Financing Receivable, Type [Domain] Accrued interest payable Interest Payable Sale and refinancing of other real estate owned Real Estate Owned, Transfer from Real Estate Owned Accrued Interest Receivable Accrued Interest Receivable [Member] Primary financial statement caption encompassing accrued interest receivable. Loan originations Payments for Loans Originated or Acquired Payments for loans originated or acquired. Finance Lease, Operating cash flows Finance Lease, Interest Payment on Liability Recorded balance Impaired Financing Receivable, Recorded Investment U.S. government sponsored enterprises US Government-sponsored Enterprises Debt Securities [Member] Lease Expense Lease, Cost [Abstract] Derivatives Used for Cash Flow Hedges Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Stock-based compensation, net of tax benefits Share-based Compensation Unfunded contingent commitments expected to be fulfilled thereafter Qualified Affordable Housing Project Investments, Commitment To Be Paid Thereafter Qualified Affordable Housing Project Investments, Commitment To Be Paid Thereafter Cash consideration Payments to Acquire Businesses, Gross Quantitative Information About Level 3 Fair Value Measurements Fair Value Measurement Inputs and Valuation Techniques [Line Items] Due after ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Debt securities, held-to-maturity Held-to-Maturity Investments, Fair Value Disclosure Fair value portion of held-to-maturity investment securities. Operating Lease, Operating cash flows Operating Lease, Payments Offsetting assets Offsetting Assets [Table Text Block] Finance Lease, ROU assets Finance Lease Right Of Use Asset, Gross Amount before accumulated amortization. Interest Income Interest and Dividend Income, Operating [Abstract] Net of tax amount Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Consolidated VIEs Variable Interest Entity, Primary Beneficiary [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Other Consumer Consumer Loan [Member] Regulatory assessments and insurance General Insurance and Federal Deposit Insurance Corporation Premium Expense The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production, including the amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance. Offsetting Derivative Assets Offsetting Derivative Assets [Abstract] Net amortization of debt securities Accretion (Amortization) of Discounts and Premiums, Investments Unfunded contingent commitments expected to be fulfilled in 2019 Qualified Affordable Housing Project Investments, Commitment To Be Paid Year One Qualified Affordable Housing Project Investments, Commitment To Be Paid Year One Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Line Items] Interest on lease liabilities Finance Lease, Interest Expense Level 3 Level 3 Fair Value, Inputs, Level 3 [Member] Entity Address, City or Town Entity Address, City or Town Unfunded contingent commitments expected to be fulfilled in 2020 Qualified Affordable Housing Project Investments, Commitment To Be Paid Year Two Qualified Affordable Housing Project Investments, Commitment To Be Paid Year Two Loans Receivable Loans Receivable [Member] Unrealized gains (losses) on available-for-sale securities Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Entity Filer Category Entity Filer Category Maturities, prepayments and calls of available-for-sale debt securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Fair value of Company shares issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Equity [Abstract] Equity [Abstract] Available-For-Sale Debt Securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Finance Lease, Lease liabilities Finance Lease, Total present value of lease payments Finance Lease, Liability Summary of loans receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Federal Home Loan Bank advances Advances from Federal Home Loan Banks Residential Real Estate Residential Portfolio Segment [Member] Fair value of consideration transferred Business Combination, Consideration Transferred [Abstract] Up to 30 Days Maturity Less than 30 Days [Member] Derivative [Table] Derivative [Table] Effective settlement of a pre-existing relationship Business Combination, Effective Settlement of a Pre-Existing Relationship Effective Settlement of a Pre-Existing Relationship on a business combination. Total Comprehensive Income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Available-for-sale Debt Securities, Available-for-sale [Abstract] Statement [Line Items] Nature of Operations and Summary of Significant Accounting Policies Statement [Line Items] Maturities of Lease Liabilities Lessee Lease Liability Maturity [Table Text Block] Tabular disclosure of undiscounted cash flows of lessee's operating and finance lease liabilities. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating and finance lease liabilities recognized in statement of financial position. Accounting Standards Update 2017-08 Accounting Standards Update 2017-08 [Member] Consideration transferred, identifiable net assets acquired and resulting goodwill Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Proceeds from sale of other real estate owned Proceeds from Sale of Wholly Owned Real Estate and Real Estate Acquired in Settlement of Loans Entity Registrant Name Entity Registrant Name Fair Value by Asset Class [Axis] Asset Class [Axis] Liabilities Liabilities [Abstract] Nature of Operations and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Mergers and acquisition expenses Business Combination, Integration Related Costs Bank-owned life insurance income, net Life Insurance, Corporate or Bank Owned, Change in Value Fair value measurement of assets measured at fair value on a non-recurring basis Fair Value Measurements, Nonrecurring [Table Text Block] Summary of the activity in the ALLL Allowance for Credit Losses on Financing Receivables [Table Text Block] Accumulated other comprehensive income (loss) Balance, beginning Balance, end Accumulated Other Comprehensive Income (Loss), Net of Tax Amendment Flag Amendment Flag Total deposits Deposits Deposits Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits Amount of deposits assumed at the acquisition date Residential mortgage-backed securities Residential Mortgage Backed Securities [Member] Due after one year through five years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost City Area Code City Area Code Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Commercial loans Interest and Fee Income, Loans, Commercial Effect of cumulative change on retained earnings from applying new accounting pronouncement New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets Securities sold under agreements to repurchase Interest Expense, Securities Sold under Agreements to Repurchase Entity Central Index Key Entity Central Index Key Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Residential real estate loans Interest and Fee Income, Loans, Consumer, Real Estate Interest bearing cash deposits Interest-bearing Deposits in Banks and Other Financial Institutions Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process Mortgage Loans in Process of Foreclosure, Amount Total Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Accumulated Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] Financial assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Impairment losses Affordable Housing Project Investment, Write-down, Amount Financing Receivable, Allowance for Credit Losses, Beginning Balance Financing Receivable, Allowance for Credit Losses, Ending Balance Financing Receivable, Allowance for Credit Losses Loans receivable Business Combination, Acquired Receivable, Fair Value (Gain) loss on sale of debt securities Gain (Loss) on Sale of Investments Common stock, shares authorized Common Stock, Shares Authorized Accounting and audit fees Accounting Fees Accounting Fees Troubled Debt Restructurings Financing Receivable, Modifications [Line Items] Printing and supplies Supplies Expense Net income Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Total Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss Selling costs Measurement Input, Cost to Sell [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] 12 Months or More Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Cash consideration Cash Consideration for Outstanding Shares Cash Consideration for Outstanding Shares Reclassification adjustments for (gains) losses included in net income Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Accumulated Other Comprehensive Loss [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Shell Company Entity Shell Company Net additions to premises and equipment Payments for (Proceeds from) Productive Assets Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Third-party Acquisition Related Costs Business Combination, Acquisition Related Costs Loans without a specific valuation allowance, Unpaid principal balance Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Due within one year Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost TDRs that Subsequently Defaulted, Recorded Balance Financing Receivable, Modifications, Subsequent Default, Recorded Investment Available-for-sale, Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] Purchases of non-marketable equity securities Payments to Acquire Federal Home Loan Bank Stock Other Comprehensive Income (Loss), Net of Tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Total stockholders' equity Balance, beginning Balance, ending Stockholders' Equity Attributable to Parent Due within one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Other assets Other Assets Loans held for sale, at fair value Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Subordinated debentures Interest Expense, Junior Subordinated Debentures Weighted-average interest rate on loans (tax-equivalent) Weighted Average Interest Rate on Loans Weighted average interest rate on loans. Loans receivable, net Loans receivable, net Loans and Leases Receivable, Net Amount Liabilities Assumed Noncash or Part Noncash Acquisition, Value of Liabilities Assumed Accumulated impairment charge Goodwill, Impaired, Accumulated Impairment Loss Schedule of Marketable Securities [Table] Schedule of Marketable Securities [Table] Schedule of Marketable Securities [Table] First Community Bank Utah First Community Bank Utah [Member] First Community Bank Utah [Member] Other Expenses Other Operating Income and Expense [Text Block] Variable Interest Entities Variable Interest Entity Disclosure [Text Block] Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Equity Component [Domain] Equity Component [Domain] Offsetting Derivative Liabilities Offsetting Derivative Liabilities [Abstract] Leases Leases Disclosure [Text Block] The entire disclosure for lessee and lessor leases. Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Unfunded contingent commitments expected to be fulfilled in 2021 Qualified Affordable Housing Project Investments, Commitment To Be Paid Year Three Qualified Affordable Housing Project Investments, Commitment To Be Paid Year Three Common Stock Common Stock [Member] Debit card expenses Debit Card Expense Debit card expense. Tax credit compliance period Tax Credit Compliance Period The period in which a tax credit project must stay in compliance for the investor to keep the tax credits. Other Expenses Other Income and Expenses [Abstract] Derivative financial instruments Derivative [Line Items] Specific valuation allowance Impaired Financing Receivable, Related Allowance FHLB advances Federal Home Loan Bank Borrowings, Fair Value Disclosure Finance Lease, Maturing three years through four years Finance Lease, Liability, Payments, Due in Rolling Year Four Non-marketable equity securities Nonmarketable Securities Equity Securities Non marketable securities, equity securities. Proceeds from sales and calls of debt securities and the associated gains and losses Gain (Loss) on Securities [Table Text Block] Principal collected on loans Proceeds from Loan and Lease Originations and Principal Collections Total debt securities Debt Securities Available-for-Sale, Amortized Cost Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract] Loans Held For Sale Loans Held For Sale [Member] This item represents loans held-for-sale including, but not limited to, mortgage loans and finance receivables. Current Fiscal Year End Date Current Fiscal Year End Date Impairment losses on receivables related to contracts with customers Capitalized Contract Cost, Accumulated Impairment Finance Lease, Maturing within one year Finance Lease, Liability, Payments, Due in Next Rolling Twelve Months (Gain) loss on sale and write-downs of other real estate owned, net Gains (Losses) on Sales of Other Real Estate Carrying value of equity investments in LIHTCs Amortization Method Qualified Affordable Housing Project Investments Gain (loss) on sale of debt securities Debt Securities, Realized Gain (Loss) Other real estate owned Other Real Estate Owned Fair Value Disclosure Other real estate owned fair value disclosure. Mortgage-backed securities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Minimum Number of Days Delinquent to Charge off Loans Financing Receivable, Threshold Period Past Due, Writeoff1 Threshold period for when financing receivable is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Paid-in capital Additional Paid in Capital, Common Stock Finance Lease Liabilities, Rolling Maturity Finance Lease Liabilities, Payments, Rolling Maturity [Abstract] Summary of the impaired loans by portfolio class of loans Summary of Impaired Loans by Portfolio Class of Loans [Abstract] Summary of the impaired loans by portfolio class of loans. Accruing loans 30 to 59 days past due Financing Receivables, 30 to 59 Days Past Due [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Loans Receivable Acquired, Gross Principal and Contractual Interest Due Business Combination, Acquired Receivables, Gross Contractual Amount Other-than-temporary impairment on debt securities Other than Temporary Impairment Losses, Investments Total before mortgage-backed securities Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Estimated Fair Value Estimate of Fair Value Measurement [Member] Non-Interest Income Noninterest Income [Abstract] Consulting and outside services Consulting Fees Consulting fees other than legal and accounting fees. Mortgage-backed securities Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Amortized Cost Net increase in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Level 1 Fair Value, Inputs, Level 1 [Member] Total before mortgage-backed securities Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Amortized Cost Total Debt Securities, Available-for-sale, Amortized Cost Measurement Basis [Axis] Measurement Basis [Axis] Due after ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Loans without a specific valuation allowance, Recorded balance Impaired Financing Receivable, with No Related Allowance, Recorded Investment Other borrowed funds Borrowings [Member] 12 Months or More Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Repurchase agreements and other borrowed funds Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Finance Lease, Weighted Average Discount Rate Finance Lease, Weighted Average Discount Rate, Percent Offsetting liabilities Offsetting Liabilities [Table Text Block] Loan portfolio aging analysis Past Due Financing Receivables [Table Text Block] Income Statement Location [Axis] Income Statement Location [Axis] Other liabilities Accounts Payable and Accrued Liabilities [Member] Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Fair Value, Option, Quantitative Disclosures Fair Value, Option, Quantitative Disclosures [Line Items] Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Net Interest Income Interest Income (Expense), Net Available-for-sale Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] Dividends declared but not paid Dividends Declared But Not Paid During the Period Dividends Declared But Not Paid During the Period Recurring Measurements Fair Value, Measurements, Recurring [Member] Interest Rate Swap Two Interest Rate Swap Two [Member] Interest rate swap. Accrued income and other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets Amount of other assets acquired at the acquisition date. Accruing loans 90 days or more past due Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Consolidated VIEs Variable Interest Entity [Line Items] Operating Lease, Lease liabilities Operating Lease, Total present value of lease payments Operating Lease, Liability Miscellaneous loan fees and charges Miscellaneous Loan Fees and Charges Miscellaneous loan fees and charges on residential real estate, commercial, agriculture, and consumer loans. Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Weighted Average Range Weighted Average [Member] Mortgage-backed securities Collateralized Mortgage Backed Securities [Member] Adjustments Due to New Accounting Pronouncements [Axis] Adjustments Due to New Accounting Pronouncements [Axis] Adjustments Due to New Accounting Pronouncements [Axis] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Liabilities Variable Interest Entity, Consolidated, Carrying Amount, Liabilities Short-term lease cost Short-term Lease, Cost Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Fair Value of Assets Acquired Noncash or Part Noncash Acquisition, Value of Assets Acquired Net interest income and non-interest income Business Acquisition, Pro Forma Revenue Total assets measured at fair value on a recurring basis Total assets measured at fair value on a non-recurring basis Assets, Fair Value Disclosure Sales of available-for-sale debt securities Proceeds from Sales and Calls of Debt Securities, Available-for-sale Proceeds from Sales and Calls of Debt Securities, Available-for-sale Gross Unrealized Gains Securities, Gross Unrealized Gain Accumulated in Investments Amount of accumulated unrealized gain before deducting unrealized loss on investments in available-for-sale and held-to-maturity securities impacting investments. Finance lease cost Finance Lease, Cost [Abstract] Commercial mortgage-backed securities Commercial Mortgage Backed Securities [Member] Qualified Affordable Housing Project Investments Qualified Affordable Housing Project Investments [Member] Qualified Affordable Housing Project Investments [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Subordinated debentures Subordinated Debt Other Commitments [Domain] Other Commitments [Domain] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Unfunded contingent commitments expected to be fulfilled in 2022 Qualified Affordable Housing Project Investments, Commitment To Be Paid Year Four Qualified Affordable Housing Project Investments, Commitment To Be Paid Year Four Average balance Impaired Financing Receivable, Average Recorded Investment Maximum Term Leases Will Be Considered Short-term Maximum Term Leases Will Be Considered Short-term Maximum Term Leases Will Be Considered Short-term Lessor Leases Lessor, Leases [Policy Text Block] Securities Sold Under Agreements to Repurchase Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] Total liabilities Liabilities Total Debt Securities, Available-for-sale and Held-to-maturity [Abstract] Loans held for sale, at fair value Loans Held-for-sale, Fair Value Disclosure Gross realized losses Held-to-Maturity Securities, Sold Security, Realized Loss This item represents the loss realized on the sale of held-to-maturity securities disposed of during the period. Additionally, this item may include, if not separately presented, any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt securities which are being or have been recognized in earnings during the period. Operating Lease, Difference between lease payments and present value of lease payments Lessee, Operating Lease, Liability, Undiscounted Excess Amount Held-to-maturity Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] Trading Symbol Trading Symbol Debt securities, held-to-maturity Amortized Cost Amortized Cost Debt Securities, Held-to-maturity Basic earnings per share Earnings Per Share, Basic Document Period End Date Document Period End Date Other Commercial Commercial Loan [Member] Finance Lease, Present Value of Lease Payments, Long-term Finance Lease, Liability, Noncurrent Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Heritage Bank Heritage Bank [Member] Heritage Bank Less than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Available-for-Sale, Fair Value Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] Amortization of debt modification costs Amortization of Debt Issuance Costs Lease Summary Lessee Lease Description [Table Text Block] Disclosure of information about lessee's leases. Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Commercial Commercial Portfolio Segment [Member] Provision for loan losses Provision for loan losses Provision for Loan, Lease, and Other Losses TDRs that Occurred During the Period, Number of Loans Financing Receivable, Modifications, Number of Contracts Common stock, $0.01 par value per share, 117,187,500 shares authorized Common Stock, Value, Outstanding Finance Lease, Difference between lease payments and present value of lease payments Finance Lease, Liability, Undiscounted Excess Amount Available-for-Sale Available-for-sale Securities, Debt Maturities [Abstract] Net increase in securities sold under agreements to repurchase Proceeds from (Payments for) in Securities Sold under Agreements to Repurchase Core deposit intangible Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Maturities, prepayments and calls of held-to-maturity debt securities Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Fair Value Debt Securities, Fair Value Fair value of investments in debt securities classified as available-for sale and held-to-maturity. Stock issued in connection with acquisitions, value Stock Issued During Period, Value, Acquisitions Securities Sold Under Agreements to Repurchase Transfers and Servicing of Financial Assets [Text Block] Variable Interest Entities Schedule of Equity Method Investments [Line Items] Investment securities Interest and Dividend Income, Securities, Operating Net Amounts of Liabilities Presented in the Statements of Financial Position Derivative Liability, Fair Value, Amount Not Offset Against Collateral Due after five years through ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Finance Lease, Total Lease Payments Finance Lease, Liability, Payments, Due Dividends declared per share Cash dividends declared per share Common Stock, Dividends, Per Share, Declared Cash on hand and in banks Cash and Due from Banks Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Subordinated debentures Subordinated Debt Obligations, Fair Value Disclosure Net income Business Acquisition, Pro Forma Net Income (Loss) Investments in variable interest entities Payments to Acquire Other Investments Total assets Total assets Assets Gross Amounts Offset in the Statements of Financial Position Derivative Liability, Fair Value, Gross Asset Debt securities, available-for-sale Fair Value Debt Securities, Available-for-sale Investments in Qualified Affordable Housing Projects Investments in Affordable Housing Projects [Abstract] Operating Lease, Maturing four years through five years Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five Number of segments in the Company's loan portfolio Financing Receivable, Number of Portfolio Segments Number of portfolio segments in the company's total financing receivables. State and local governments US States and Political Subdivisions Debt Securities [Member] Available-for-sale, Unrealized Loss Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Stock issuances under stock incentive plans, value Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Cash and cash equivalents Cash, Cash Equivalents, and Federal Funds Sold Finance Lease, Weighted Average Remaining Lease Term Finance Lease, Weighted Average Remaining Lease Term Operating Lease, Thereafter Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five Document Fiscal Period Focus Document Fiscal Period Focus Summary of TDRs Troubled Debt Restructurings on Financing Receivables [Table Text Block] New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Assets New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Assets New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Assets Document Type Document Type Securities Sold Under Agreements to Repurchase Transfers and Servicing of Financial Assets [Abstract] Non-accrual loans Financing Receivable, Recorded Investment, Nonaccrual Status Summary of debt securities Gain (Loss) on Securities [Line Items] Held-to-maturity, Fair Value Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract] Fair value measurement of assets and liabilities measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Due within one year Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Tax Identification Number Entity Tax Identification Number TDRs that Subsequently Defaulted, Number of Loans Financing Receivable, Modifications, Subsequent Default, Number of Contracts Tax effect Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Income Statement [Abstract] Income Statement [Abstract] 2019 Acquisitions Current Year Acquisitions [Member] Consists of all acquisitions occurring during the current year. Total other comprehensive income (loss), net of tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Core deposit intangibles amortization Amortization of core deposit intangibles Amortization of Intangible Assets Goodwill Roll Forward Goodwill [Roll Forward] Entity Interactive Data Current Entity Interactive Data Current Add: dilutive restricted stock awards and stock options Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Number of Operating Segments Number of Operating Segments VIE amortization and other expenses VIE Write-downs, Losses and Other Expenses Write-downs, Losses and Other Expenses related to Variable Interest Entities. Federal and state income tax expense Income Tax Expense (Benefit) Forecasted Notional Amount Derivative Liability, Notional Amount Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Loans with a specific valuation allowance, Recorded balance Impaired Financing Receivable, with Related Allowance, Recorded Investment Current loans receivable Financing Receivable, Recorded Investment, Current Due after one year through five years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Fair value of common stock shares issued Stock Issued Cash dividends declared Dividends, Common Stock, Cash Debt Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Net cash received from acquisitions Payments to Acquire Businesses, Net of Cash Acquired Business development Business Development Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Reclassification adjustment for (gains) losses included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Total identifiable assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Local Phone Number Local Phone Number Total liabilities and stockholders' equity Liabilities and Equity Unfunded contingent commitments expected to be fulfilled in 2023 Qualified Affordable Housing Project Investments, Commitment To Be Paid Year Five Qualified Affordable Housing Project Investments, Commitment To Be Paid Year Five Net purchase accounting (discounts) premiums included in loans receivable Unamortized Discounts and Premiums on Loans Amount of premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Amortized cost, gross unrealized gains and losses and fair value of debt securities Marketable Securities [Table Text Block] State Bank of Arizona State Bank of Arizona [Member] State Bank of Arizona Held-to-maturity Debt Securities, Held-to-maturity, Sale or Transfer of Investment [Abstract] Due after five years through ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Total non-interest income Noninterest Income Other Comprehensive Income Other Comprehensive Income (Loss) [Member] Statement, Equity Components [Axis] Equity Components [Axis] Combined Approach Combined Approach Valuation Technique [Member] Combined Approach [Member] Loans receivable Gross loans Total loans receivable Loans and Leases Receivable, Net of Deferred Income Loans and Leases Receivable Disclosure Loans and Leases Receivable Disclosure [Abstract] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Allowance for Loan and Lease Losses and Loans Receivable Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Changes in fair value, gain (loss) Fair Value, Option, Changes in Fair Value, Gain (Loss) Average outstanding shares - diluted Average outstanding shares - diluted Weighted Average Number of Shares Outstanding, Diluted Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Derivatives Derivative Liability Gross realized gains Held-to-Maturity Securities, Sold Security, Realized Gain This item represents the gain realized on the sale of held-to-maturity securities disposed of during the period. Loans with a specific valuation allowance, Average balance Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Loss on Termination of Interest Rate Swaps Loss on Derivative Instruments, Pretax Operating Lease, Net right-of-use assets Operating Lease, Right-of-Use Asset Preferred shares, par value Preferred Stock, Par or Stated Value Per Share Collateral-dependent impaired loans, net of ALLL Collateral Dependent Impaired Loans Owned Fair Value Disclosure Collateral dependent impaired loans owned fair value disclosure. Loss on termination of hedging activities Loss On Hedging Activity Loss incurred in hedging activities. Charge-offs Financing Receivable, Allowance for Credit Losses, Write-downs Repayments of long-term Federal Home Loan Bank advances Payments of FHLBank Borrowings, Financing Activities Residential Real Estate Residential Real Estate [Member] Employee expenses Miscellaneous Employee Expenses Miscellaneous employee expenses other than compensation and benefits. Investment Securities Schedule of Marketable Securities [Line Items] [Line Items] for Schedule of Marketable Securities [Table] [Table] Due after ten years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Cash paid during the period for income taxes Income Taxes Paid Preferred shares, $0.01 par value per share, 1,000,000 shares authorized, none issued or outstanding Preferred Stock, Value, Issued Gross Unrealized Gains Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Assets with a recorded change resulting from re-measuring at fair value on a non-recurring basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Net Income Net income Net income available to common stockholders, basic and diluted Net Income (Loss) Attributable to Parent Other expenses Total other expenses Other Noninterest Expense Variable lease cost Variable Lease, Cost Income Before Income Taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Other Commitments [Axis] Other Commitments [Axis] Net increase in accrued interest payable Increase (Decrease) in Interest Payable, Net Mortgage-backed securities Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Accrued interest receivable Interest Receivable Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Allowance for loan and lease losses Total allowance for loan and lease losses Loans and Leases Receivable, Allowance Entity Small Business Entity Small Business Total liabilities measured at fair value on a recurring basis Total financial liabilities Financial Liabilities Fair Value Disclosure Entity File Number Entity File Number Lessee Leases Lessee, Leases [Policy Text Block] Allowance for Loan and Lease Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Operating Lease Liabilities, Rolling Maturity Operating Lease Liabilities, Payments, Due, Rolling Maturity [Abstract] Operating Lease, Present Value of Lease Payments, Short-term Operating Lease, Liability, Current Unaudited Pro Forma Summary of the Company as if the Acquisitions had Occurred at the Beginning of the Period Business Acquisition, Pro Forma Information [Table Text Block] Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table] Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table] Total identifiable net assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Due after ten years Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] Sublease income Sublease Income Principles of Consolidation Consolidation, Policy [Policy Text Block] Activity within Accumulated Other Comprehensive Income (Loss), Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Non-interest bearing deposits Noninterest-bearing Deposit Liabilities Interest expense recorded on interest rate swaps Derivative, Cost of Hedge Data processing Information Technology and Data Processing Compensation and employee benefits Labor and Related Expense Legal fees Legal Fees Gross Amounts of Recognized Assets Derivative Asset, Fair Value, Gross Asset Other comprehensive income (loss) before reclassification Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Net (decrease) increase in other liabilities Increase (Decrease) in Other Operating Liabilities Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Financial Instrument [Axis] Financial Instrument [Axis] 12 Months or More Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Changes in the carrying value of goodwill Goodwill Rollforward [Text Block] Tabular disclosure of goodwill rollforward schedule. Finance Lease, Net ROU assets Finance Lease, Right-of-Use Asset Loans without a specific valuation allowance, Average balance Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Advertising and promotions Advertising Expense Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Supplemental Cash Flow Information Lessee Lease Cash Flow [Table Text Block] Lessee Lease Cash Flow [Table Text Block] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] U.S. government and federal agency US Government Agencies Debt Securities [Member] Unpaid principal balance Impaired Financing Receivable, Unpaid Principal Balance Allowance for loan and lease losses Financing Receivable, Allowance for Credit Losses [Roll Forward] Total past due and non-accrual loans Financing Receivable Recorded Investment Past Due and Non Accrual Loans Financing receivable recorded investment past due and non accrual loans. Non-Recurring Measurements Non-Recurring Measurements Fair Value, Measurements, Nonrecurring [Member] Bank-owned life insurance Bank Owned Life Insurance Amortization expense and tax credits and other tax benefits recognized for qualified affordable housing project investments Equity Method Investments [Table Text Block] Collateral-dependent impaired loans, net of ALLL Impaired Loans, Measurement Input Value of input used to measure impaired loans. Held-to-Maturity Debt Securities, Held-to-maturity, Maturity [Abstract] Other Expenses [Abstract] Other Expenses [Abstract] Offsetting [Abstract] Offsetting [Abstract] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Financial Assets Assets, Fair Value Disclosure [Abstract] Other Other Cost and Expense, Operating Number of Quarters Used to Evaluate Historical Loss Experience Financing Receivable, Allowance for Credit Losses, Number of Quarters Used to Evaluate Historical Loss Experience The number of quarters used to evaluate the historical loss experience when determining the general valuation allowance component of the allowance for credit losses. Net accretion of purchase accounting adjustments Accretion (Amortization) of Discounts and Premiums, Business Combinations The sum of the periodic adjustments of the differences between business combination asset and liability fair values and carrying values that are charged against earnings. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. Unrealized (losses) gains on derivatives used for cash flow hedges Amount of (loss) gain recognized in OCI Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax Loan portfolio aging analysis Financing Receivable, Recorded Investment, Aging [Abstract] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Total interest expense Interest Expense Other borrowed funds Other Borrowings Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Operating Lease, Maturing within one year Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months Origination of loans held for sale Payments for Origination and Purchases of Loans Held-for-sale Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Service charges and other fees Service Charges and Other Fees Service Charges and Other Fees on Deposit Accounts. Derivative, Name [Domain] Derivative Contract [Domain] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Leases [Abstract] Leases [Abstract] Minimum Range Minimum [Member] Total non-interest expense Noninterest Expense Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Operating Lease, Maturing two years through three years Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three Loans with a specific valuation allowance, Unpaid principal balance Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Entity Address, Address Line One Entity Address, Address Line One Operating lease cost Operating Lease, Cost Offsetting Liabilities [Table] Offsetting Liabilities [Table] Summary of ALLL and loans receivable Summary of Recorded Investment in Loans and ALLL on Portfolio Class Basis [Table Text Block] Summary of recorded investment in loans and ALLL on a portfolio class basis. Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Number of years for home equity loan origination term Number of years for home equity loans origination term Number of years for home equity loans origination term Recoveries Financing Receivable, Allowance for Credit Losses, Recovery Percentage of Outstanding Common Stock Acquired Business Acquisition, Percentage of Voting Interests Acquired Federal Home Loan Bank advances Interest Expense Federal Home Loan Bank Advance Interest expense federal home loan bank advance. Summary of Loans Receivable Financing Receivable, Net [Abstract] Cash dividends paid Payments of Ordinary Dividends, Common Stock Earnings Per Share Earnings Per Share [Text Block] Past due loans Financing Receivable, Recorded Investment, Past Due Other real estate owned Other Real Estate, Foreclosed Assets, and Repossessed Assets Basic and Diluted Earnings Per Share Earnings Per Share Reconciliation [Abstract] Postage Postage Expense Stock issuances under stock incentive plans, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document and entity information. Recognized amounts of identifiable assets acquired and liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Asset Class [Domain] TDRs that Occurred During the Period, Post-modification recorded balance Financing Receivable, Modifications, Post-Modification Recorded Investment Gross realized gains Available-for-sale Securities, Gross Realized Gains Other income Noninterest Income, Other Operating Income Maximum Range Maximum [Member] Title of 12(b) Security Title of 12(b) Security