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Regulatory Capital Requirements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage capital to average assets, Minimum Requirements $ 132,881us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy $ 65,847us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Tier 1 capital to risk-weighted assets, Minimum Requirements 97,620us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 47,853us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Total capital to risk-weighted assets, Minimum Requirements 195,240us-gaap_CapitalRequiredForCapitalAdequacy 95,706us-gaap_CapitalRequiredForCapitalAdequacy
Tier 1 leverage capital to average assets, Minimum Requirements, Percentage 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Tier 1 capital to risk-weighted assets, Minimum Requirements, Percentage 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Total capital to risk-weighted assets, Minimum Requirements, Percentage 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier 1 leverage capital to average assets, Actual 340,292us-gaap_TierOneLeverageCapital 185,951us-gaap_TierOneLeverageCapital
Tier 1 capital to risk-weighted assets, Actual 340,292us-gaap_TierOneRiskBasedCapital 185,951us-gaap_TierOneRiskBasedCapital
Total capital to risk-weighted assets, Actual 368,198us-gaap_Capital 201,076us-gaap_Capital
Tier 1 leverage capital to average assets, Actual, Percentage 10.20%us-gaap_TierOneLeverageCapitalToAverageAssets 11.30%us-gaap_TierOneLeverageCapitalToAverageAssets
Tier 1 capital to risk-weighted assets, Actual, Percentage 13.90%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 15.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Total capital to risk-weighted assets, Actual, Percentage 15.10%us-gaap_CapitalToRiskWeightedAssets 16.80%us-gaap_CapitalToRiskWeightedAssets
Heritage Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage capital to average assets, Minimum Requirements 132,853us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 65,831us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 capital to risk-weighted assets, Minimum Requirements 97,585us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 47,807us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Total capital to risk-weighted assets, Minimum Requirements 195,171us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 95,613us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 leverage capital to average assets, Minimum Requirements, Percentage 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 capital to risk-weighted assets, Minimum Requirements, Percentage 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Total capital to risk-weighted assets, Minimum Requirements, Percentage 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 leverage capital to average assets, Well-Capitalized Requirements 166,066us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 82,288us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 capital to risk-weighted assets, Well-Capitalized Requirements 146,378us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 71,710us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Total capital to risk-weighted assets, Well-Capitalized Requirements 243,964us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 119,517us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 leverage capital to average assets, Well-Capitalized Requirements, Percentage 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 capital to risk-weighted assets, Well-Capitalized Requirements, Percentage 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Total capital to risk-weighted assets, Well-Capitalized Requirements, Percentage 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 leverage capital to average assets, Actual 332,147us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 182,543us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 capital to risk-weighted assets, Actual 332,147us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 182,543us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Total capital to risk-weighted assets, Actual $ 360,053us-gaap_Capital
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 $ 197,656us-gaap_Capital
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 leverage capital to average assets, Actual, Percentage 10.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 11.10%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Tier 1 capital to risk-weighted assets, Actual, Percentage 13.60%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 15.30%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember
Total capital to risk-weighted assets, Actual, Percentage 14.80%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember		 16.50%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= hfwa_HeritageBankMember