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Noncovered Loans Receivable (Mortgage Banking Loans) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]      
Loans held for sale at lower of cost or market $ 5,582,000us-gaap_LoansHeldForSaleMortgages $ 0us-gaap_LoansHeldForSaleMortgages  
Commitments to sell mortgage loans   0us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell  
Servicing fee income 260,000us-gaap_FeesAndCommissionsMortgageBanking 106,000us-gaap_FeesAndCommissionsMortgageBanking 139,000us-gaap_FeesAndCommissionsMortgageBanking
Mortgage Receivable [Member]      
Mortgage Loans on Real Estate [Line Items]      
Loans held for sale at lower of cost or market 5,582,000us-gaap_LoansHeldForSaleMortgages
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		 0us-gaap_LoansHeldForSaleMortgages
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		  
One-to-four family residential loans sold during the year 55,997,000us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		 8,460,000us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		  
Commitments to sell mortgage loans 10,625,000us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		 0us-gaap_LoansAndLeasesReceivableCommitmentsToPurchaseOrSell
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		  
Commitments to fund mortgage loans (at interest rates approximating market rates), Fixed rate 8,467,000us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		 0us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		  
Commitments to fund mortgage loans (at interest rates approximating market rates), Variable or adjustable rate 2,158,000us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		 0us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		  
SBA Loans [Member]      
Mortgage Loans on Real Estate [Line Items]      
SBA loans serviced for others with participating interest 77,233,000us-gaap_QualitativeAndQuantitativeInformationAssetsOrLiabilitiesForTransferorsContinuingInvolvementInSecuritizationOrAssetbackedFinancingArrangementPrincipalAmountsOutstanding
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hfwa_SBALoansMember		 [1] 26,854,000us-gaap_QualitativeAndQuantitativeInformationAssetsOrLiabilitiesForTransferorsContinuingInvolvementInSecuritizationOrAssetbackedFinancingArrangementPrincipalAmountsOutstanding
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hfwa_SBALoansMember		 [1]  
SBA loans serviced for others with no participating interest 0hfwa_TransferofFinancialAssetsAccountedforasSalesAmountDerecognized
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hfwa_SBALoansMember		 0hfwa_TransferofFinancialAssetsAccountedforasSalesAmountDerecognized
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hfwa_SBALoansMember		  
Participating interest owned by the Bank $ 29,000,000us-gaap_QualitativeAndQuantitativeInformationAssetOrLiabilityTransferorsContinuingInvolvementSecuritizationOrAssetbackedFinancingPrincipalAmountOutstandingContinuedRecognitionAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hfwa_SBALoansMember		 $ 9,400,000us-gaap_QualitativeAndQuantitativeInformationAssetOrLiabilityTransferorsContinuingInvolvementSecuritizationOrAssetbackedFinancingPrincipalAmountOutstandingContinuedRecognitionAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hfwa_SBALoansMember		  
[1] Represents the gross balance of the loan at year end. The participation owned by the Bank totaled $29.0 million and $9.4 million, respectively, at December 31, 2014 and 2013 and is included in the balance of noncovered loans receivable on the Company's Consolidated Statements of Financial Condition.