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Quality Indicators Receivable [Policy Text Block] Qualified Affordable Housing Project Investments, Future Commitment Qualified Affordable Housing Project Investments, Future Commitment Qualified Affordable Housing Project Investments, Future Commitment Equity Awards Adjustments Equity Awards Adjustments [Member] Effective Income Tax Rate Reconciliation, Bank Owned Life Insurance Surrender, Amount Effective Income Tax Rate Reconciliation, Bank Owned Life Insurance Surrender, Amount Effective Income Tax Rate Reconciliation, Bank Owned Life Insurance Surrender, Amount Total Past  Due Financial Asset, Past Due [Member] Net realized losses Debt Securities, Available-for-Sale, Realized Gain (Loss) Total liabilities and stockholders’ equity Liabilities and Equity Business Combination, Pro Forma Information, Nonrecurring Adjustment, Acquisition-Related Cost Business Combination, Pro Forma Information, Nonrecurring Adjustment, Acquisition-Related Cost [Member] MBS and Other asset-backed securities(1) Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, without Single Maturity Date Employee Stock Option Share-Based Payment Arrangement, Option [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Paid Date Dividends Payable, Date to be Paid Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Pass Pass [Member] Schedule of Loans Receivable, Amortized Cost by Portfolio Segment Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Investment Securities, Classified as Trading Debt Securities, Trading Tabular List, Table Tabular List [Table Text Block] Stockholders Equity (Textual) [Abstract] Stockholders Equity (Textual) [Abstract] Stockholders Equity (Textual) [Abstract] Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Outstanding Share Percent Authorized for Repurchase Stock Repurchase Program Percentage of Outstanding Shares Authorized for Repurchase Stock repurchase program percentage of outstanding shares authorized for repurchase. Valuation, Market Approach Valuation, Market Approach [Member] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Schedule of Realized Gains and Losses on Sale of Investment Securities Available for Sale Schedule of Realized Gain (Loss) [Table Text Block] Transfers of loans receivable to other real estate owned Real Estate Owned, Transfer to Real Estate Owned Preferred Stock, Shares Authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, no par value, 2,500,000 shares authorized; no shares issued and outstanding, respectively Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Commercial CMO and MBS(1) Commercial Mortgage-Backed Securities [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Federal Home Loan Bank stock, at cost Federal Home Loan Bank stock, at cost Federal Home Loan Bank stock, at cost Hedging Designation [Axis] Hedging Designation [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Assets measured at fair value on a nonrecurring basis Assets, Fair Value Disclosure Name Measure Name Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Total outstanding commitments Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Business Combination, Consideration Transferred Business Combination, Consideration Transferred Interest and fees on loans Interest and Fee Income, Financing Receivable Junior subordinated debentures Junior Subordinated Notes Entity Filer Category Entity Filer Category Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Equipment Equipment [Member] Schedule of Outstanding Commitments to Extend Credit, Off-Balance-Sheet [Table] Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] Investment Program, Proportional Amortization Method, Elected [Table] Investment Program, Proportional Amortization Method, Elected [Table] Other securities pledged Other Securities Pledged [Member] Other Securities Pledged [Member] Impairment Goodwill, Impairment Loss Restricted stock units vested Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Repayment of borrowings Repayments of Short-Term Debt Dividends [Axis] Dividends [Axis] Accrued interest receivable Interest Receivable Name Trading Arrangement, Individual Name Third Parties Third Parties [Member] Third Parties [Member] Cash and cash equivalents Cash and Cash Equivalent Declared Dividends Payable, Date Declared Company Selected Measure Amount Company Selected Measure Amount Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] Bank owned life insurance Business Combination, Recognized Asset Acquired, Bank owned life insurance Business Combination, Recognized Asset Acquired, Bank owned life insurance Non-hedging interest rate derivatives Not Designated as Hedging Instrument [Member] Equity Method Investments and Joint Ventures [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Puget Sound Bancorp Puget Sound Merger [Member] Puget Sound Merger [Member] Transfers of premises and equipment classified as held for sale to prepaid expenses and other assets from premises and equipment, net Transfer of Premises and Equipment to Prepaid Expenses and Other Assets Held-for-sale Transfer of Premises and Equipment to Prepaid Expenses and Other Assets Held-for-sale Collateral Dependent Loans Financing Receivable, Excluding Accrued Interest, Collateral-dependent Loans Financing Receivable, Excluding Accrued Interest, Collateral-dependent Loans Schedule of Stock Repurchased [Table] Stock, Class of Stock [Table] Schedule of Changes in Allowance For Credit Losses on Loans Receivable [Line Items] Allowance for Loan and Lease Losses [Roll Forward] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Share price (in usd per share) Business Combination, Price Per Share Derivative liabilities - interest rate swaps Derivative Liability Finite-Lived Core Deposits, Gross Finite-Lived Core Deposits, Gross Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Right of use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Investment Securities, Held for Sale, Fair Value, Classified by Contractual Maturity Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract] Corporate obligations Debt Security, Corporate, US [Member] Income tax expense Income Tax Expense (Benefit) Income Tax Expense (Benefit) Total noninterest expense Noninterest Expense Unamortized net discount on acquired loans Financing Receivable, Unamortized Purchase Premium (Discount) Restricted stock units vested (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Charge-offs Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Notional Amounts Derivative Liability, Notional Amount Investment Securities, Available for Sale, Accrued Interest Receivable Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss MBS and Other asset-backed securities(1) Debt Securities, Held-to-Maturity, Maturity, without Single Maturity Date, Fair Value Net income Net Income Net income Net income Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Proceeds from sales of premises and equipment Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Restatement Determination Date: Restatement Determination Date [Axis] Certificates of deposit Certificates of Deposit [Member] Loans Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Schedule of Loans Receivable, Nonaccrual Financing Receivable, Nonaccrual [Table Text Block] Number of loan segments Number of Loan Segments Number of loan segments. Amortization of net unrealized gain for the reclassification of investment securities available for sale to held to maturity, net of tax of $(6), $(21), $(13), and $(41) respectively OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax Estimated Fair Value Derivative Asset, Subject to Master Netting Arrangement, before Offset Proceeds from borrowings Proceeds from Short-Term Debt Business Combination, Pro Forma Information, Non-interest income (loss) Business Combination, Pro Forma Information, Non-interest income (loss) Business Combination, Pro Forma Information, Non-interest income (loss) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]