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Investment Securities (Amortized Cost and Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Scheduled of amortized cost and fair value of securities pledged as collateral    
Amortized Cost $ 213,441hfwa_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAmortizedCost $ 114,556hfwa_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAmortizedCost
Fair Value 217,624us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue 114,774us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
Washington and Oregon state to secure public deposits    
Scheduled of amortized cost and fair value of securities pledged as collateral    
Amortized Cost 150,507hfwa_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAmortizedCost
/ invest_InvestmentHoldingAxis
= hfwa_WashingtonAndOregonStateToSecurePublicDepositsMember		 80,386hfwa_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAmortizedCost
/ invest_InvestmentHoldingAxis
= hfwa_WashingtonAndOregonStateToSecurePublicDepositsMember
Fair Value 153,785us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
/ invest_InvestmentHoldingAxis
= hfwa_WashingtonAndOregonStateToSecurePublicDepositsMember		 80,881us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
/ invest_InvestmentHoldingAxis
= hfwa_WashingtonAndOregonStateToSecurePublicDepositsMember
Federal Reserve Bank and FHLB to secure borrowing arrangements    
Scheduled of amortized cost and fair value of securities pledged as collateral    
Amortized Cost 4,430hfwa_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAmortizedCost
/ invest_InvestmentHoldingAxis
= hfwa_FederalReserveBankAndFederalHomeLoanBankToSecureBorrowingsMember		 0hfwa_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAmortizedCost
/ invest_InvestmentHoldingAxis
= hfwa_FederalReserveBankAndFederalHomeLoanBankToSecureBorrowingsMember
Fair Value 4,460us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
/ invest_InvestmentHoldingAxis
= hfwa_FederalReserveBankAndFederalHomeLoanBankToSecureBorrowingsMember		 0us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
/ invest_InvestmentHoldingAxis
= hfwa_FederalReserveBankAndFederalHomeLoanBankToSecureBorrowingsMember
Repurchase agreements    
Scheduled of amortized cost and fair value of securities pledged as collateral    
Amortized Cost 43,676hfwa_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAmortizedCost
/ invest_InvestmentHoldingAxis
= us-gaap_RepurchaseAgreementsMember		 34,170hfwa_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAmortizedCost
/ invest_InvestmentHoldingAxis
= us-gaap_RepurchaseAgreementsMember
Fair Value 44,457us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
/ invest_InvestmentHoldingAxis
= us-gaap_RepurchaseAgreementsMember		 33,893us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
/ invest_InvestmentHoldingAxis
= us-gaap_RepurchaseAgreementsMember
Other securities pledged    
Scheduled of amortized cost and fair value of securities pledged as collateral    
Amortized Cost 14,828hfwa_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAmortizedCost
/ invest_InvestmentHoldingAxis
= hfwa_OtherSecuritiesPledgedMember		 0hfwa_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAmortizedCost
/ invest_InvestmentHoldingAxis
= hfwa_OtherSecuritiesPledgedMember
Fair Value $ 14,922us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
/ invest_InvestmentHoldingAxis
= hfwa_OtherSecuritiesPledgedMember		 $ 0us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
/ invest_InvestmentHoldingAxis
= hfwa_OtherSecuritiesPledgedMember