Income Tax Disclosure [Abstract] Balance, beginning of year Unrecognized Tax Benefits Increases related to prior year tax positions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Balance, end of year Statement of Comprehensive Income [Abstract] Net income Net Income (Loss) Attributable to Parent Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract] Unrealized holding (loss) gain arising during the year, net of tax (benefit) expense of $(2,163), $1,942 and $(3,400) OCI, before Reclassifications, Net of Tax, Attributable to Parent Reclassification adjustment for net gains included in net income, net of tax expense of $49, $172 and $889 Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Regulatory Capital Requirements [Abstract] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] HomeStreet Bank [Member] HomeStreet Bank [Member] HomeStreet Bank [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] HomeStreet Inc [Member] Parent Company [Member] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Tier 1 leverage capital Tier One Leverage Capital Tier 1 leverage capital to average assets, ratio Tier One Leverage Capital to Average Assets Tier 1 leverage capital required for capital adequacy purposes Tier One Leverage Capital Required for Capital Adequacy Tier 1 leverage capital required for capital adequacy purposes, ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets Tier 1 leverage capital required to be categorized as well capitalized Tier One Leverage Capital Required to be Well Capitalized Tier 1 leverage capital required to be categorized as well capitalized, ratio Tier One Leverage Capital Required to be Well Capitalized to Average Assets Common equity risk-based capital Tier 1 Common Equity Capital Tier 1 Risk Based Common Equity Capital as defined in the regulations. Common equity risk-based capital to risk weighted assets, ratio Common Equity Risk Based Capital to Risk Weight Assets The amount of Common Equity Risk Based Capital required to be categorized as well capitalized divided by risk weight assets. Common equity risk-based capital required for capital adequacy Common equity risk-based capital required for capital adequacy Common equity risk-based capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. Common equity risk-based capital required for capital adequacy, ratio Common Equity Risk Based Capital Required for Capital Adequacy to Risk Weight Assets Common Equity Risk Based Capital Required for Capital Adequacy to Risk Weight Assets Common equity capital required to be well capitalized Common equity risk-based capital required to be well capitalized The amount of Common Equity Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. Common equity risk-based capital required to be well capitalized, ratio Common equity risk-based capital required to be well capitalized percent Common equity risk-based capital required to be well capitalized percent Tier 1 risk-based capital Tier One Risk Based Capital Tier 1 risk-based capital to risk weighted assets, ratio Tier One Risk Based Capital to Risk Weighted Assets Tier 1 risk-based capital required for capital adequacy Tier One Risk Based Capital Required for Capital Adequacy Tier 1 risk-based capital required for capital adequacy, ratio Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Tier 1 risk-based capital required to be well capitalized Tier One Risk Based Capital Required to be Well Capitalized Tier 1 risk-based capital required to be well capitalized, ratio Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Total risk-based capital Capital Capital to risk weighted assets, ratio Capital to Risk Weighted Assets Total capital required for capital adequacy Capital Required for Capital Adequacy Total capital required for capital adequacy, ratio Capital Required for Capital Adequacy to Risk Weighted Assets Total capital required to be well capitalized Capital Required to be Well Capitalized Total capital required to be well capitalized, ratio Capital Required to be Well Capitalized to Risk Weighted Assets Restructuring and Related Activities [Abstract] Restructuring Reserve Rollforward Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Mortgage Banking [Abstract] Projected Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2019 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2024 and thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Carrying value of multifamily MSR Servicing Asset at Amortized Cost Income Statement [Abstract] Interest income: Interest and Dividend Income, Operating [Abstract] Loans Interest and Fee Income, Loans and Leases Investment securities Interest and Dividend Income, Securities, Operating Other Other Interest and Dividend Income Total interest income Interest and Dividend Income, Operating Interest expense: Interest Expense [Abstract] Deposits Interest Expense, Deposits Federal Home Loan Bank advances Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Short-term Federal funds purchased and securities sold under agreements to repurchase Interest Expense, Securities Sold under Agreements to Repurchase Long-term debt Interest Expense, Long-term Debt Other Interest Expense, Other Total interest expense Interest Expense Net interest income Interest Income (Expense), Net Provision for credit losses Provision for Loan, Lease, and Other Losses Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Noninterest income: Noninterest Income [Abstract] Net gain on loan origination and sale activities Net Gains Losses on Mortgage Loan Origination and Sales Activities Net gain on mortgage loan origination and sale activities. Loan servicing income Servicing Fees Net1 Servicing Fees Net1 Income from WMS Series LLC Income (Loss) from Equity Method Investments Depositor and other retail banking fees Depositor and Other Retail Banking Fees Depositor and other retail banking fees. Insurance agency commissions Insurance Commissions and Fees Gain on sale of investment securities available for sale Debt Securities, Available-for-sale, Realized Gain (Loss) Other Noninterest Income (Expense), Other Noninterest Income (Expense), Other Total noninterest income Noninterest Income Noninterest expense: Noninterest Expense [Abstract] Salaries and related costs Labor and Related Expense General and administrative General and Administrative Expense Amortization of core deposit intangibles Amortization of Intangible Assets Legal Legal Fees Consulting Professional Fees Federal Deposit Insurance Corporation assessments Federal Deposit Insurance Corporation Premium Expense Occupancy Occupancy, Net Information services Communications and Information Technology Net (benefit) cost from operation and sale of other real estate owned Net cost (income) from operations and sale of other real estate owned Amount of net cost (income) from operations and sale of other real estate owned during the period. Total noninterest expense Noninterest Expense Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense (benefit) Income Tax Expense (Benefit) NET INCOME Basic income per share (in dollars per share) Earnings Per Share, Basic Diluted income per share (in dollars per share) Earnings Per Share, Diluted Basic weighted average number of shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted weighted average number of shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Segment Reporting [Abstract] BUSINESS SEGMENTS Segment Reporting Disclosure [Text Block] Receivables [Abstract] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Consumer Portfolio Segment [Member] Consumer Portfolio Segment [Member] Commercial Real Estate Portfolio Segment [Member] Commercial Real Estate Portfolio Segment [Member] Commercial Portfolio Segment [Member] Commercial Portfolio Segment [Member] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable, Type [Domain] Residential Mortgage [Member] Residential Mortgage [Member] Home Equity Line of Credit [Member] Home Equity Line of Credit [Member] Non-Owner Occupied Commercial Real Estate [Member] Non Owner Occupied Commercial Real Estate [Member] Non Owner Occupied Commercial Real Estate [Member] Multifamily [Member] Multifamily Residential [Member] Residential multifamily property. Construction Loans [Member] Construction Loans [Member] Owner Occupied Commercial Real Estate [Member] Owner Occupied Commercial Real Estate [Member] Owner Occupied Commercial Real Estate [Member] Commercial Business [Member] Commercial Loan [Member] Credit Quality Indicator [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Pass [Member] Pass [Member] Watch [Member] Watch [Member] A category of financing receivables that has a remote risk of default but is exhibiting deficiency or weakness that requires monitoring. Special Mention [Member] Special Mention [Member] Substandard [Member] Substandard [Member] Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Designated Loan Grades by Loan Portfolio Segment and Loan Class [Abstract] Designated loan grades by loan portfolio segment and loan class. Total loans receivable before fees and costs Loans and Leases Receivable, before Fees, Gross Fair value of loans held for investment Loans Receivable, Fair Value Disclosure Equity [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Beginning balance Stockholders' Equity Attributable to Parent Other comprehensive (loss) income before reclassifications Ending balance Accounting Policies [Abstract] Interest payments deferral period Debt Instrument, Interest Payments Deferral Period Debt Instrument, Interest Payments Deferral Period Banking and Thrift [Abstract] Federal Home Loan Bank, Advances [Table] Federal Home Loan Bank, Advances [Table] Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank of Des Moines [Member] Federal Home Loan Bank of Des Moines [Member] Federal Reserve Bank of San Francisco [Member] Federal Reserve Bank of San Francisco [Member] Federal reserve bank of San Francisco [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Weighted Average [Member] Weighted Average [Member] Federal Home Loan Bank and Other Borrowings [Line Items] Federal Home Loan Bank, Advances [Line Items] Advances from Federal Home Loan Banks Advances from Federal Home Loan Banks Weighted-average interest rates on the advances Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End Available line of credit with the FHLB as a percentage of assets Federal Home Loan Bank, Available Line of Credit, Percentage of Assets Federal Home Loan Bank, Available Line of Credit, Percentage of Assets Borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Federal Home Loan Bank Stock Federal Home Loan Bank Stock FHLB stock impairment FHLB stock impairment OTTI impairment of FHLB stock investment Line of credit facility, amount outstanding from FRBSF Long-term Line of Credit Federal funds purchased and securities sold under agreements to repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Representations and Warranties Reserve for Loan Receivables [Member] Representations and Warranties Reserve for Loan Receivables [Member] A reserve for expected or probable losses from the repurchase of loan receivables related to certain representations and warranties made at the time the loan was sold. Loss Contingencies [Line Items] Loss Contingencies [Line Items] Balance, beginning of period Loss Contingency Accrual Additions, net of adjustments Loss Contingency Accrual, Provision Realized losses Loss Contingency Accrual, Payments Balance, end of period Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Class of Financing Receivable, Type [Domain] Single family [Member] Multifamily DUS [Member] Multifamily DUS [Member] Multifamily DUS - commercial mortgage. SBA [Member] Small Business Administration Loan [Member] Small Business Administration Loan [Member] CRE Non-DUS [Member] Commercial Real Estate, Excluding DUS [Member] Commercial Real Estate, Excluding DUS [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Loans sold Proceeds from Sale of Mortgage Loans Held-for-sale Proceeds from sale of loans originated as held for investment Proceeds from Sale of Loans Held-for-investment Maintenance (reimbursements) costs Cost of Property Repairs and Maintenance Loss provisions Real Estate Owned, Valuation Allowance, Provision, Net of Portion Attributable to FHA Real Estate Owned, Valuation Allowance, Provision, Net of Portion Attributable to FHA Net gain on sales Gains (Losses) on Sales of Other Real Estate Net (income) cost from operation and sale of other real estate owned Advertising Expense Advertising Expense Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Early Buyout Loans [Member] Early Buyout Loans [Member] Loans for which the entity has the unilateral right to repurchase out of a mortgage pool. Such loans accounted for as a repurchase. Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Mortgage Banking Operations (Narrative) [Abstract] Mortgage Banking Operations (Textual) [Abstract] Mortgage banking operations. Servicing advances Servicing Advances Advances made as part of the entity's obligations as a servicer. Loans receivable, in Ginnie Mae pool Loans Receivable, Net Weighted average life of company's multifamily MSRs Expected Weighted Average Life of MSR Expected Weighted Average Life of MSR Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Measurements, Nonrecurring [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 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] Loans held for investment Investments, Fair Value Disclosure Total Assets, Fair Value Disclosure Assets and Liabilities Measured at Fair Value on Nonrecurring Basis [Abstract] Assets and liabilities measured at fair value on nonrecurring basis. Gains/losses on loans held for investment Gains Losses on Loans Held for Investment Gains losses on loans held for investment. Total gains/(losses) Gain (Loss) on Disposition of Assets for Financial Service Operations Investments, Debt and Equity Securities [Abstract] Amortized Cost and Estimated Fair Value of Available for Sale Securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Amortized Cost and Estimated Fair Value of Held to Maturity Securities Debt Securities, Held-to-maturity [Table Text Block] Investment Securities in an Unrealized Loss Position Schedule of Unrealized Loss on Investments [Table Text Block] Amortized Cost and Estimated Fair Value by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Sales of Investment Securities Available for Sale Schedule of Realized Gain (Loss) [Table Text Block] Schedule of Financial Instruments Owned and Pledged as Collateral Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block] INCOME TAXES Income Tax Disclosure [Text Block] Schedule of Loans Held for Sale and Sold Mortgage Loans on Real Estate, by Loan Disclosure [Table Text Block] Tabular disclosure of mortgage loans on Real Estate, held for sale and sold. Net Gain on Mortgage Loan Origination and Sale Activity Net Gain on Mortgage Loan Origination and Sale Activity [Table Text Block] Net gain on mortgage loan origination and sale activity. Company's Portfolio of Loans Serviced for Others Portfolio of Loans Serviced for Others [Table Text Block] Company's portfolio of loans serviced for others. Schedule of Mortgage Repurchase Losses Mortgage Repurchase Losses [Table Text Block] Mortgage Repurchase Losses rollforward Revenue from Mortgage Servicing, Including the Effects of Derivative Risk Management Instruments Schedule of Revenue from Mortgage Servicing Including Effects of Derivative Risk Management Instruments [Table Text Block] Revenue from mortgage servicing, including the effects of derivative risk management instruments. Key Economic Assumptions Used in Measuring Initial FV of Capitalized Single Family MSRs Key Economic Assumptions Used in Measuring Initial Value of Capitalized Single Family Created from Loan Sales with Retained Servicing [Table Text Block] Key economic assumptions used in measuring the initial value of capitalized single family MSRs created from loan sales with retained servicing. Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Changes in Single Family MSRs Measured at Fair Value Schedule of Servicing Assets at Fair Value [Table Text Block] Changes in Multifamily MSRs Measured at the Lower of Amortized Cost or Fair Value Servicing Asset at Amortized Cost [Table Text Block] Projected Amortization Expense for the Gross Carrying Value of Multifamily MSRs Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Fair Value Measurement Methodologies Fair Value Measurement Methodologies [Table Text Block] Fair value measurement methodologies. Schedule of Fair Value Hierarchy Measurement Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value Measurements Recurring and Nonrecurring Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Schedule of Fair Value Changes and Activity for Level 3 Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value Measurements on Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] LOANS AND CREDIT QUALITY Financing Receivables [Text Block] ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME Comprehensive Income (Loss) Note [Text Block] Proceeds Proceeds from Sale of Debt Securities, Available-for-sale Gross gains Debt Securities, Available-for-sale, Realized Gain Gross losses Debt Securities, Available-for-sale, Realized Loss Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Financing Receivable, Modification, Type of Concession [Axis] Financing Receivable, Modification, Type of Concession [Axis] Describes the type of concession given by the entity to debtor. Financing Receivable, Concessions [Domain] Financing Receivable, Concessions [Domain] Concessions given to a borrower under a loan modification. Interest Rate Reduction [Member] Interest Rate Reduction [Member] Interest rate reduction. Payment Restructure [Member] Payment Restructure [Member] Payment restructure. Number of loan modifications - TDR Financing Receivable, Modifications, Number of Contracts Recorded investment - TDR Financing Receivable, Modifications, Recorded Investment at Period End Financing Receivable, Modifications, Recorded Investment at Period End Related charge-offs - TDR Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down Allowance for Doubtful Accounts Receivable [Roll Forward] Allowance for Doubtful Accounts Receivable [Roll Forward] Beginning balance Financing Receivable, Allowance for Credit Losses Recoveries, net of charge-offs Financing Receivable, Allowance for Credit Losses, Write-downs (Recovery) Financing Receivable, Allowance for Credit Losses, Write-downs (Recovery) Ending balance Allowance for loan losses Loans and Leases Receivable, Allowance Allowance for unfunded commitments Allowance For Unfunded Commitments Allowance For Unfunded Commitments Allowance for credit losses Condensed Financial Information Disclosure [Abstract] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Parent Company [Member] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Net purchases of and proceeds from investment securities Purchase of and proceeds from sale of marketable securities Purchase of and proceeds from sale of marketable securities Net payments for investments in and advances to subsidiaries Payments for investments in and advances to subsidiaries Payments for investments in and advances to subsidiaries Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of common stock Proceeds from Stock Options Exercised Proceeds from issuance of long-term debt Proceeds from Issuance of Long-term Debt Proceeds from equity raise Proceeds from Issuance or Sale of Equity Proceeds from and repayment of advances from subsidiaries Proceeds from advances from subsidiaries Proceeds from advances from subsidiaries Other, net Proceeds from (Payments for) Other Financing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities (Decrease) increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of year Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of year Goodwill impairment Goodwill and Intangible Asset Impairment Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill at beginning of period Goodwill Acquisitions Goodwill, Acquired During Period Goodwill at end of period Real Estate Owned, Valuation Allowance [Roll Forward] Real Estate Owned Valuation Allowance [Roll Forward] Beginning balance Real Estate Owned, Valuation Allowance Loss provisions Real Estate Owned, Valuation Allowance, Provision (Charge-offs), net of recoveries Real Estate Owned, Valuation Allowance, Amounts Applied Ending balance Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Facility related costs [Member] Facility Closing [Member] Personnel related costs [Member] Employee Severance [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Restructuring charges Restructuring Charges MORTGAGE BANKING OPERATIONS Mortgage Banking Operations [Text Block] Mortgage banking operation. Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Opus Bank [Member] Opus Bank [Member] Opus Bank [Member] Boston Private Bank and Trust [Member] Boston Private Bank and Trust [Member] Boston Private Bank and Trust [Member] Bank of Oswego [Member] Bank of Oswego [Member] Bank of Oswego [Member] OCBB [Member] OCBB [Member] Orange County Business Bank acquisition Business Acquisition [Line Items] Business Acquisition [Line Items] Number of branches opened Number of Branches Opened Number of Branches Opened Goodwill from acquisition Purchase price of acquisition Business Combination, Consideration Transferred Number of equity interest issued and issuable per shares acquired Business Acquisition, Equity Interests Issued or Issuable per Share Acquired Business Acquisition, Equity Interests Issued or Issuable per Share Acquired. Acquisition share price (in dollars per share) Business Acquisition, Share Price Number of shares of equity interest acquired Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Internal Credit Assessment [Axis] Doubtful [Member] Doubtful [Member] Unlikely to be Collected Financing Receivable [Member] Unlikely to be Collected Financing Receivable [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] WASHINGTON WASHINGTON CALIFORNIA CALIFORNIA Residential Mortgage And Multifamily [Member] Residential Mortgage And Multifamily [Member] Residential Mortgage And Multifamily [Member] Financial Instrument [Axis] Federal Home Loan Bank Advances [Member] Federal Home Loan Bank Advances [Member] Federal Reserve Bank Advances [Member] Federal Reserve Bank Advances [Member] Number of operating segments Number of Operating Segments Loans pledged as collateral Loans Pledged as Collateral Percentage of loan portfolio Percentage of Loan Portfolio Percentage of total loan portfolio. Total loans held for investment Loans and Leases Receivable, Gross Number of days past due on re-default consumer loans Trouble Debt Restructuring, Re-Default, Number Of Days Past Due, Consumer Trouble Debt Restructuring, Re-Default, Number of Days Past Due, Consumer Number of days past due on re-default commercial loans Trouble Debt Restructuring, Re-Default, Number Of Days Past Due, Commercial Trouble Debt Restructuring, Re-Default, Number Of Days Past Due, Commercial Property, Plant and Equipment [Abstract] Furniture and equipment Furniture and Fixtures, Gross Leasehold improvements Leasehold Improvements, Gross Land and buildings Buildings and Improvements, Gross Property, plant and equipment, Gross Property, Plant and Equipment, Gross Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, plant and equipment, Net Property, Plant and Equipment, Net Condensed Income Statement [Table] Condensed Income Statement [Table] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Net interest expense Noninterest income (Loss) income before income tax benefit and equity in income of subsidiaries Revenues, Excluding Dividend Income From Subsidiaries Revenues, Excluding Dividend Income From Subsidiaries Dividend from subsidiaries to parent Investments in and Advances to Affiliates, Dividends or Interest Revenue Revenues Noninterest expense Income tax benefit Income from subsidiaries Income (Loss) from Subsidiaries, Net of Tax Other comprehensive (loss) income Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Mortgage Banking [Member] Mortgage Banking [Member] Consumer and Commercial Banking [Member] Consumer and Commercial Banking [Member] Consumer and Commercial Banking [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Condensed income statement: Segment Reporting Information, Profit (Loss) [Abstract] Net interest income Noninterest expense Income tax (benefit) expense Total assets Assets BUSINESS COMBINATIONS Business Combination Disclosure [Text Block] Retirement Benefits [Abstract] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Defined Contribution Plan Tranches [Axis] Defined Contribution Plan Tranches [Axis] Defined Contribution Plan Tranches [Axis] Defined Contribution Plan Tranches [Domain] Defined Contribution Plan Tranches [Domain] [Domain] for Defined Contribution Plan Tranches [Axis] Tranche One [Member] Define Contribution Plan, Tranche One [Member] Define Contribution Plan, Tranche One [Member] Tranche Two [Member] Defined Contribution Plan, Tranche Two [Member] Defined Contribution Plan, Tranche Two [Member] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Defined contribution plan automatic enrollment percent Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Percentage of employer matching Defined Contribution Plan, Employer Matching Contribution, Percent of Match Employer contribution amount Defined Contribution Plan, Employer Discretionary Contribution Amount Deposit balances, including stated rates Deposit Balances Including Stated Rates [Table Text Block] Deposit balances, including stated rates. Interest expense on deposits Interest Expense on Deposits [Table Text Block] Interest expense on deposits. Certificates of deposit outstanding Schedule of Maturities of Certificate of Deposits [Table Text Block] Schedule of maturities of certificate of deposits. Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] 3-Month LIBOR [Member] Three Month LIBOR [Member] Three Month LIBOR [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Subordinated Debt [Member] Subordinated Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] HomeStreet Statutory Trust Subordinated Debt Securities I [Member] HomeStreet Statutory Trust Subordinated Debt Securities I [Member] HomeStreet Statutory Trust Subordinated Debt Securities I [Member] HomeStreet Statutory Trust Subordinated Debt Securities II [Member] HomeStreet Statutory Trust Subordinated Debt Securities II [Member] HomeStreet Statutory Trust Subordinated Debt Securities II [Member] HomeStreet Statutory Trust Subordinated Debt Securities III [Member] HomeStreet Statutory Trust Subordinated Debt Securities III [Member] HomeStreet Statutory Trust Subordinated Debt Securities III HomeStreet Statutory Trust Subordinated Debt Securities IV. [Member] HomeStreet Statutory Trust Subordinated Debt Securities IV. [Member] HomeStreet Statutory Trust Subordinated Debt Securities IV. Debt Instrument [Line Items] Debt Instrument [Line Items] Amount Debt Instrument, Face Amount Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Call option Debt Instrument, Call Option Term of a call option on a debt instrument. Quarterly Financial Information Disclosure [Abstract] Schedule of Supplemental Quarterly Financial Information Quarterly Financial Information [Table Text Block] Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table] Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table] Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table] Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities [Member] Commercial Mortgage Backed Securities [Member] Commercial Mortgage Backed Securities [Member] Residential Collateralized Mortgage Obligations [Member] Collateralized Residential Mortgage Obligations [Member] The category includes multiclass, pay-through securitizations collateralized by residential mortgages secured by assets, such as automobiles and boats, which are generally structured so that the collections of principal and interest due from the underlying debtors are paid to the holders of the CMO. Commercial Collateralized Mortgage Obligations [Member] Collateralized Commercial Mortgage Obligations [Member] The category includes multiclass, pay-through securitizations collateralized by commercial mortgages secured by assets, such as automobiles and boats, which are generally structured so that the collections of principal and interest due from the underlying debtors are paid to the holders of the CMO. Municipal Bonds [Member] Municipal Bonds [Member] Corporate Debt Securities [Member] Corporate Debt Securities [Member] US Treasury Securities [Member] US Treasury Securities [Member] Agency debentures [Member] Agency Securities [Member] Collateralized Mortgage Obligations [Member] Collateralized Mortgage Obligations [Member] Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] [Line Items] for Schedule of Available-for-sale Securities and Held-to-maturity Securities [Table] Computation of Weighted Average Yield Using Coupon on Fair Value Computation of Weighted Average Yield Using Coupon on Fair Value [Abstract] Computation of weighted average yield using coupon on fair value. AVAILABLE FOR SALE Debt Securities, Available-for-sale [Abstract] Due within one year or less, Fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Due after one year through five years, Fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value Due after five years through ten years, Fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value Due after ten years, Fair value Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value Fair value Debt Securities, Available-for-sale Due in one year or less, Weighted Average Yield Available for Sale Securities Debt Maturities within One Year Weighted Average Yield Available for sale securities debt maturities with in one year weighted average yield. Due after one year through five years, Weighted Average Yield Available for Sale Securities Debt Maturities After One Through Five Years Weighted Average Yield Available-for-sale securities debt maturities year two through five fair value Due after five years through ten years, Weighted Average Yield Available for Sale Securities Debt Maturities After Five Through Ten Years Weighted Average Yield Available for sale securities debt maturities after five through ten years weighted average yield. Due after ten years, Weighted Average Yield Available for Sale Securities Debt Maturities After Ten Years Weighted Average Yield Available for sale securities debt maturities after ten years weighted average yield. Weighted average yield Available for Sale Securities Debt Maturities Without Single Maturity Date Weighted Average Yield Available for sale securities debt maturities without single maturity date weighted average yield. Held-to-maturity Securities Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] Due within one year or less, Fair value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Due after one year through five years, Fair value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Due after five years through ten years, Fair value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value Due after ten years, Fair value Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Fair Value Debt Securities, Held-to-maturity, Fair Value Due in one year or less, Weighted Average Yield HeldToMaturitySecuritiesDebtMaturitiesAverageYieldWithinOneYear This item represents the average yield on debt securities with maturities within one year of the balance sheet date and which are categorized as held-to-maturity. Due after one year through five years, Weighted Average Yield HeldToMaturitySecuritiesDebtMaturitiesAverageYieldAfterOneThroughFiveYears This item represents the average yield on debt securities with maturities expected to mature after one through five years from the balance sheet date and which are categorized as held-to-maturity. Due after five years through ten years, Weighted Average Yield HeldToMaturitySecuritiesDebtMaturitiesAverageYieldAfterFiveThroughTenYears This item represents the average yield on debt securities with maturities after five through ten years as of the balance sheet date and which are categorized as held-to-maturity. Due after ten years, Weighted Average Yield HeldToMaturitySecuritiesDebtMaturitiesAverageYieldAfterTenYears This item represents the average yield on debt securities with maturities due after ten years as of the balance sheet date and which are categorized as held-to-maturity. Weighted average yield HeldToMaturitySecuritiesDebtMaturitiesAverageYield This item represents average yield on the total of all debt securities grouped by maturity dates, at fair value, which are categorized as held-to-maturity. Security pledged under repurchase agreement Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements Tax exempt interest income on available-for-sale securities Interest Income, Securities, Operating, Tax Exempt Loans and Leases Receivable, Related Parties [Roll Forward] Loans and Leases Receivable, Related Parties [Roll Forward] Beginning balance Loans and Leases Receivable, Related Parties Principal repayments and advances, net Loans and Leases Receivable, Related Parties, Proceeds Ending balance Schedule of Servicing Assets at Fair Value [Table] Schedule of Servicing Assets at Fair Value [Table] Servicing Assets at Fair Value [Line Items] Servicing Assets at Fair Value [Line Items] Beginning balance Servicing Asset at Fair Value, Amount Originations Servicing Asset at Fair Value, Additions Purchases Servicing Asset at Fair Value Additions Purchase Servicing asset at fair value additions purchase. Sale of single family MSRs Servicing Asset at Fair Value, Disposals Changes due to modeled amortization Changes in Fair Value of Mortgage Servicing Rights Due to Modeled Amortization Changes in the fair value of mortgage servicing rights due to modeled amortization. Net additions and amortization Servicing Asset at Fair Value, Additions and Amortization, Net Servicing Asset at Fair Value, Additions and Amortization, Net Changes in fair value of MSRs due to changes in market inputs and/or model updates Servicing Asset at Fair Value, Other Changes in Fair Value Ending balance Residential Mortgage [Member] Available-for-sale Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Less than 12 months, Gross unrealized losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Less than 12 months, fair value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 12 months or more, Gross unrealized losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 12 months or more, Fair value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Total gross unrealized losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Total fair value Debt Securities, Available-for-sale, Unrealized Loss Position Less than 12 months, Gross unrealized losses Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Less than 12 months, Fair value Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 12 months or more, Gross unrealized losses Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 12 months or more, Fair value Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Total gross unrealized losses Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss Total Fair value Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Construction/land development [Member] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] 30 to 59 Days Past Due [Member] Financing Receivables, 30 to 59 Days Past Due [Member] 60 to 89 Days Past Due [Member] Financing Receivables, 60 to 89 Days Past Due [Member] 90 Days or More Past Due [Member] Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Total past due Financing Receivable, Recorded Investment, Past Due Current Financing Receivable, Recorded Investment, Current Total loans 90-days or more past due and still accruing Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Cash and cash equivalents (includes interest-earning instruments of $28,534 and $30,268) Investment securities (includes $851,968 and $846,268 carried at fair value) Marketable Securities Loans held for sale (includes $321,868 and $577,313 carried at fair value) Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Loans held for investment (net of allowance for loan losses of $41,470 and $37,847; includes $4,057 and $5,477 carried at fair value) Loans and Leases Receivable, Net Amount Mortgage servicing rights (includes $252,168 and $258,560 carried at fair value) Servicing Asset Other real estate owned Other Real Estate, Foreclosed Assets, and Repossessed Assets Federal Home Loan Bank stock, at cost Premises and equipment, net Goodwill Other assets Other Assets Total assets LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Liabilities: Liabilities [Abstract] Deposits Deposits Federal Home Loan Bank advances Accounts payable and other liabilities Accounts Payable and Accrued Liabilities Long-term debt Long-term Debt Total liabilities Liabilities Commitments and contingencies (Note 13) Commitments and Contingencies Shareholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, no par value, authorized 10,000 shares, issued and outstanding, 0 shares and 0 shares Preferred Stock, Value, Issued Common stock, no par value, authorized 160,000,000 shares, issued and outstanding, 26,995,348 shares and 26,888,288 shares Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders' equity Total liabilities and shareholders' equity Liabilities and Equity PREMISES AND EQUIPMENT, NET Property, Plant and Equipment Disclosure [Text Block] Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] UNAUDITED QUARTERLY FINANCIAL DATA Quarterly Financial Information [Text Block] INVESTMENT SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Schedule of Federal Home Loan Bank Advance by Maturity Federal Home Loan Bank Advance by Maturity [Table Text Block] Schedule of Federal Home Loan Bank Advance by year of maturity. Earnings Per Share [Abstract] Weighted average shares: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Dilutive effect of outstanding common stock equivalents (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Diluted weighted average number of shares outstanding (in shares) Earnings per share: Earnings Per Share, Basic and Diluted [Abstract] Aggregate number of common stock equivalents and unvested restricted stock Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Schedule of Premises and Equipment Property, Plant and Equipment [Table Text Block] Effective Income Tax Rate Reconciliation, Amount [Abstract] Income taxes at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State income tax expense net of federal tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Tax-exempt interest Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Amortization of and pass-through losses from low income housing investments Low income housing tax credit partnerships Low income housing tax credit partnerships - income from LIHTC Change in state rate Change in state tax rate Change in state tax rate - income tax expense from a change in the state rate Return to provision Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount Impact from Federal Rate Change Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Uncertain tax positions Effective Income Tax Reconciliation, Uncertain Tax Positions, Amount Effective Income Tax Reconciliation, Uncertain Tax Positions, Amount Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Total income tax expense (benefit) Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Stockholders' Equity Attributable to Parent [Abstract] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (in shares) Common Stock, Shares, Outstanding Share-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition Common stock issued (in shares) Stock Issued During Period, Shares, New Issues Common stock issued Stock Issued During Period, Value, New Issues Ending balance (in shares) Single Family Residential [Member] Single Family Residential [Member] Single family residential. Single Family other [Member] Single Family Residential Mortgage Loans, Excluding U.S. Government Agency Mortgage Backed Securities [Member] Single family residential mortgage loans, excluding loans held in U.S. Government Agency mortgage pools. Other [Member] Commercial Mortgage, Other [Member] Commercial Mortgage, Other [Member] Total loans serviced for others Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding EARNINGS PER SHARE Earnings Per Share [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] SHARE-BASED COMPENSATION PLANS Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Shell Company Entity Shell Company Smaller Reporting Company Entity Small Business Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float LONG-TERM DEBT Debt Disclosure [Text Block] REGULATORY CAPITAL REQUIREMENTS Regulatory Capital Requirements under Banking Regulations [Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] 401(k) SAVINGS PLAN Compensation and Employee Benefit Plans [Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] DERIVATIVES AND HEDGING ACTIVITIES Derivative Instruments and Hedging Activities Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Minimum Rental Payment Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] Fair Value, Level 3 Unobservable Input Reconciliation Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Loans held for sale [Member] Loans held for sale [Member] Loans held for sale [Member] Loans held for investment [Member] Loans held for investment [Member] Loans held for investment [Member] Interest Rate Lock Commitments [Member] Interest Rate Lock Commitments [Member] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning balance, net Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Additions Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Transfers Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Total realized/unrealized gains Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Ending balance, net Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] TDR balances which have subsequently re-defaulted Redefaulted Troubled Debt Restructurings on Financing Receivable [Abstract] Re-defaulted troubled debt restructurings on financing receivable. Number of loan relationships that re-defaulted Financing Receivable, Modifications, Subsequent Default, Number of Contracts Recorded investment Financing Receivable, Modifications, Subsequent Default, Recorded Investment Condensed Financial Statements [Table] Condensed Financial Statements [Table] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Assets: Other assets Investment in stock of subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Liabilities: Other liabilities Shareholders' Equity: Preferred stock, no par value Common stock, no par value Additional paid-in capital Retained earnings Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Investment Securities Marketable Securities, Policy [Policy Text Block] Federal Home Loan Bank Stock Federal Home Loan Bank Stock [Policy Text Block] Federal Home Loan Bank Stock [Policy Text Block] Loans Held for Sale Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block] Loans Held for Investment Finance, Loan and Lease Receivables, Held-for-investment, Policy [Policy Text Block] Nonaccrual Loans Loans and Leases Receivable, Nonaccrual Loan and Lease Status, Policy [Policy Text Block] Impaired Loans Impaired Financing Receivable, Policy [Policy Text Block] Troubled Debt Restructurings Loans and Leases Receivable, Troubled Debt Restructuring Policy [Policy Text Block] Allowance for Credit Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Other Real Estate Owned Real Estate Owned, Valuation Allowance, Policy [Policy Text Block] Mortgage Servicing Rights Loans and Leases Receivable, Mortgage Banking Activities, Policy [Policy Text Block] Investment in WMS Series LLC Equity Method Investments [Policy Text Block] Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Trust Preferred Securities Debt, Policy [Policy Text Block] Federal Funds Purchased and Securities Sold Under Agreements to Repurchase Repurchase and Resale Agreements Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Derivatives and Hedging Activities Derivatives, Policy [Policy Text Block] Share-Based Employee Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Commitments, Guarantees, and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Earnings per Share Earnings Per Share, Policy [Policy Text Block] Business Segments Segment Reporting, Policy [Policy Text Block] Advertising Expense Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Recent Accounting Developments New Accounting Pronouncements, Policy [Policy Text Block] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Measurement Input, Prepayment Rate [Member] Measurement Input, Prepayment Rate [Member] Measurement Input, Discount Rate [Member] Measurement Input, Discount Rate [Member] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Rates per annum [Abstract] Rates Per Annum [Abstract] Rates per annum. Servicing asset, measurement input Servicing Asset, Weighted Average Measurement Input Servicing Asset, Weighted Average Measurement Input FEDERAL HOME LOAN BANK AND OTHER BORROWINGS Federal Home Loan Bank and Other Borrowings [Text Block] Entire disclosure for Federal Home Loan Bank and other borrowings. Comparability adjustment [Member] Measurement Input, Comparability Adjustment [Member] Discount for lack of marketability [Member] Measurement Input, Discount for Lack of Marketability [Member] Asset Class [Domain] Loans Receivable [Member] Loans Receivable [Member] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Transfers between levels of fair value hierarchy Fair Value Measurement Transfers Between With Levels of Hierarchy for Assets and Liabilities Held Fair value measurement transfers between with levels of hierarchy for assets and liabilities held. Range of stated value Loans Held-for-Investment, Measurement Input Adjustment Loans Held-for-Investment, Measurement Input Adjustment Loans Held for Investment Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Loans to Related Parties and their Associates Schedule of Related Party Transactions [Table Text Block] Activity in the allowance for credit losses Allowance for Credit Losses on Financing Receivables [Table Text Block] Allowance for credit losses by loan portfolio segment and loan class Allowance for Credit Losses by Loan Portfolio Segment and Loan Class [Table Text Block] Allowance for credit losses by loan portfolio segment and loan class. Recorded investment in loans by Impairment Methodology Loans by Impairment Methodology [Table Text Block] Gives the balance of loans collectively evalulated for impairment and loans individually evaluated for impairment. Impaired loans by loan portfolio segment and loan class Impaired Financing Receivables [Table Text Block] Designated loan grades by loan portfolio segment and loan class Financing Receivable Credit Quality Indicators [Table Text Block] Past due loans by loan portfolio segment and loan class Past Due Financing Receivables [Table Text Block] Performing and nonaccrual loan balances by portfolio segment and loan class Performing and Nonaccrual Loan Balances by Loan Portfolio Segment and Loan Class [Table Text Block] Performing and nonaccrual loan balances by loan portfolio segment and loan class. TDR activity by loan portfolio segment and loan class Troubled Debt Restructurings on Financing Receivables [Table Text Block] TDR balances that subsequently re-defaulted Redefaulted Troubled Debt Restructurings on Financing Receivables [Table Text Block] Redefaulted troubled debt restructurings on financing receivables. Available-for-sale Debt Securities: Mortgage Backed and Collateral Mortgage Obligation [Abstract] Mortgage backed and collateral mortgage obligation. Amortized cost Debt Securities, Available-for-sale, Amortized Cost Gross unrealized gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Gross unrealized losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Fair value Held-to-maturity Securities Amortized cost Debt Securities, Held-to-maturity Gross unrealized gains Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Gross unrealized losses Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Fair value Key economic assumptions and the sensitivity of the current fair value for single family MSRs Accounts, Notes, Loans and Financing Receivable, Classified [Abstract] Single family mortgage servicing rights Expected weighted-average life (in years) Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life Constant prepayment rate Fair Value Input Prepayment Rate Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. Impact on fair value of 25 basis points adverse change in interest rates Impact on Fair Value of Twenty Five Basis Points Decrease Impact on fair value of 25 basis points decrease. Impact on fair value of 50 basis points adverse change in interest rates Impact on Fair Value of Fifty Basis Points Decrease Impact on fair value of 50 basis points decrease. Discount rate Fair Value Input Discount Rate Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. Impact on fair value of 100 basis points increase Impact on Fair Value of Hundred Basis Points Increase Impact on fair value of 100 basis points increase. Impact on fair value of 200 basis points increase Impact on Fair Value of Two Hundred Basis Points Increase Impact on fair value of 200 basis points increase. Schedule of Financial Information by Operating Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Residential Collateralized Mortgage Obligations [Member] Collateralized Mortgage Obligations Residential [Member] Collateralized mortgage obligations residential. Commercial Collateralized Mortgage Obligations [Member] Collateralized Mortgage Obligations Commercial [Member] Collateralized mortgage obligations commercial. U.S. Treasury Securities [Member] Us Treasury Collateralized Mortgage Obligations [Member] US treasury collateralized mortgage obligations. Eurodollar Future [Member] Eurodollar Future [Member] Forward Contracts [Member] Forward Contracts [Member] Interest Rate Swaption [Member] Interest Rate Swaption [Member] Interest Rate Swap [Member] Interest Rate Swap [Member] Fair Value Hierarchy and NAV [Domain] Level 1 [Member] Assets: Assets, Fair Value Disclosure [Abstract] Investment securities available for sale Single family loans held for sale Loans Held-for-sale, Fair Value Disclosure Single family loans held for investment Derivative Assets Derivative Asset Total assets Liabilities: Liabilities, Fair Value Disclosure [Abstract] Derivative Liabilities Derivative Liability Total Liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Fair value [Member] Estimate of Fair Value Measurement [Member] Financing Receivable, Impaired [Line Items] Impaired loans by loan portfolio segment and loan class [Abstract] Impaired Loans by Loan Portfolio Segment and Loan Class [Abstract] Impaired loans by loan portfolio segment and loan class. Recorded investment With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Recorded Investment Unpaid principal balance With no related allowance recorded Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Recorded investment With related allowance recorded Impaired Financing Receivable, with Related Allowance, Recorded Investment Unpaid principal balance With related allowance recorded Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Total Recorded investment Impaired Financing Receivable, Recorded Investment Total Unpaid principal balance Impaired Financing Receivable, Unpaid Principal Balance Related allowance Impaired Financing Receivable, Related Allowance Recorded investment on performing modifications loan Financing Receivable, Modifications, Performing, Recorded Investment The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings and are currently performing in accordance with the contractual terms of the modification. Notional Amount and Fair Value for Derivatives Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Net Gains (Losses) Recognized on Economic Hedge Derivatives Derivative Instruments, Gain (Loss) [Table Text Block] FAIR VALUE MEASUREMENT Fair Value Disclosures [Text Block] Interest income Interest expense Basic earnings per share (in dollars per share) Diluted earnings per share (in dollars per share) Loans held for investment Loans held for investment before deferred fees, costs and allowance Net deferred loan fees and costs Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Loans held for investment, net of deferred loan fees and costs Loans and Leases Receivable, Net of Deferred Income Allowance for losses on loans held for investment Loans held for investment Revenue from Contract with Customer [Abstract] Percentage of Revenue in scope with ASU 2014-09 Revenue Recognition, Percentage Of Revenue In Scope With Accounting Standard Update 2014-09 Revenue Recognition, Percentage Of Revenue In Scope With Accounting Standard Update 2014-09 Accrual Financing Receivable Recorded Investment Performing Financing receivable that is considered to be performing and are still accruing interest. Nonaccrual Financing Receivable, Recorded Investment, Nonaccrual Status Total Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Balance, Beginning period Restructuring Reserve Costs paid or otherwise settled Payments for Restructuring Balance, Period end Average recorded investment Impaired Financing Receivable, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, Interest Income, Accrual Method Federal Home Loan Bank to secure borrowings Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank Washington and California State to secure public deposits Pledged Assets Not Separately Reported Securities Pledged For State and Local Governments Pledged Assets Not Separately Reported Securities Pledged For State and Local Governments. Securities pledged to secure derivatives in a liability position Pledged Financial Instruments, Securities pledged to secure derivatives in a liability position Pledged Financial Instruments, Securities pledged to secure derivatives in a liability position Other securities pledged Pledged Assets Separately Reported Other Securities Pledged Pledged Assets Separately Reported Other Securities Pledged Total securities pledged as collateral Pledged Financial Instruments, Not Separately Reported, Securities Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Loan origination and sale activities [Member] Loans [Member] Loan servicing income (loss) [Member] Servicing Contracts [Member] Other [Member] Other Credit Derivatives [Member] Mortgages [Member] Mortgages [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Net gain (loss) recognized on derivatives, including economic hedge Derivative, Gain (Loss) on Derivative, Net Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation, amortization and accretion Depreciation, Amortization and Accretion, Net Net fair value adjustment and gain on sale of loans held for sale Increase (Decrease) in Loans Held-for-sale Fair value adjustment of loans held for investment Origination of mortgage servicing rights Increase (Decrease) in Mortgage Servicing Rights Increase (Decrease) in Mortgage Servicing Rights Change in fair value of mortgage servicing rights Mortgage Servicing Rights (MSR) Impairment (Recovery) Net gain on sale of investment securities Net gain on sale of loans originated as held for investment Gain (Loss) on Sale of Loans and Leases Net fair value adjustment, gain on sale and provision for losses on other real estate owned Net fair value adjustment, gain (loss) and provision on Other Real Estate Owned Net fair value adjustment, gain (loss) and provision on Other Real Estate Owned Loss on disposal of fixed assets Gain (Loss) on Disposition of Assets Loss on lease abandonment Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Net deferred income tax expense (benefit) Increase (Decrease) in Deferred Income Taxes Share-based compensation expense Share-based Compensation Origination of loans held for sale Payments for Origination of Mortgage Loans Held-for-sale Proceeds from sale of loans originated as held for sale Proceeds from Sale of Loans Held-for-sale Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] (Increase) decrease in accounts receivable and other assets Increase (decrease) in accounts receivable and other assets Increase or decrease in accounts receivable and other assets. (Decrease) increase in accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Other Liabilities Increase (decrease) in accounts payable and other liabilities. Net cash provided by (used in) operating activities CASH FLOWS FROM INVESTING ACTIVITIES: Purchase of investment securities Payments to Acquire Investments Proceeds from sale of investment securities Principal repayments and maturities of investment securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Proceeds from sale of other real estate owned Proceeds from Sale of Other Real Estate Loans purchased from others Payments to Acquire Loans Receivable Proceeds from sale of mortgage servicing rights Proceeds from Sale of Mortgage Servicing Rights (MSR) Mortgage servicing rights purchased from others Payments to Acquire Mortgage Servicing Rights (MSR) Capital expenditures related to other real estate owned Capital Expenditures Related to Other Real Estate Owned Capital expenditures related to other real estate owned. Origination of loans held for investment and principal repayments, net Payments for (Proceeds from) Loans and Leases Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Net cash acquired from acquisitions Cash Acquired in Excess of Payments to Acquire Business CASH FLOWS FROM FINANCING ACTIVITIES: Increase in deposits, net Increase (Decrease) in Deposits Proceeds from Federal Home Loan Bank advances Proceeds from FHLBank Borrowings, Financing Activities Repayment of Federal Home Loan Bank advances Payments for FHLBank Advance, Investing Activities Proceeds from federal funds purchased and securities sold under agreements to repurchase Proceeds from Federal Funds Purchased and Securities Sold under Agreements to Repurchase Proceeds from Federal Funds Purchased and Securities Sold under Agreements to Repurchase Repayment of federal funds purchased and securities sold under agreements to repurchase Payments for Securities Sold under Agreements to Repurchase The cash outflow from investments sold under the agreement to repurchase such investment. Proceeds from line of credit draws Proceeds from Lines of Credit Repayment of line of credit draws Repayments of Lines of Credit Proceeds from Federal Home Loan Bank stock repurchase Proceeds from Sale of Federal Home Loan Bank Stock Purchase of Federal Home Loan Bank stock Payments to Acquire Federal Home Loan Bank Stock Proceeds from debt issuance, net (Payments) proceeds from equity raise, net Proceeds from (Repurchase of) Equity Proceeds from stock issuance, net Proceeds from Issuance of Common Stock NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect CASH, CASH EQUIVALENTS AND RESTRICTED CASH: Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]