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Heritage Financial Corporation (Parent Only) (Condensed Statement of Financial Condition) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
May 01, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Balance Sheet Statements, Captions [Line Items]          
Cash and interest earning deposits $ 121,636us-gaap_CashAndCashEquivalentsAtCarryingValue   $ 130,400us-gaap_CashAndCashEquivalentsAtCarryingValue $ 104,268us-gaap_CashAndCashEquivalentsAtCarryingValue $ 123,173us-gaap_CashAndCashEquivalentsAtCarryingValue
Total assets 3,457,750us-gaap_Assets   1,659,038us-gaap_Assets    
Junior subordinated debentures 19,082us-gaap_JuniorSubordinatedNotes 18,900us-gaap_JuniorSubordinatedNotes 0us-gaap_JuniorSubordinatedNotes    
Other liabilities 45,650us-gaap_OtherLiabilities   14,667us-gaap_OtherLiabilities    
Total stockholders’ equity 454,506us-gaap_StockholdersEquity   215,762us-gaap_StockholdersEquity 198,938us-gaap_StockholdersEquity 202,520us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity 3,457,750us-gaap_LiabilitiesAndStockholdersEquity   1,659,038us-gaap_LiabilitiesAndStockholdersEquity    
Parent Company          
Condensed Balance Sheet Statements, Captions [Line Items]          
Cash and interest earning deposits 8,835us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  2,645us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
16,251us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
20,542us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Investment in subsidiary bank 465,442us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  212,354us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other assets 863us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  1,041us-gaap_OtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total assets 475,140us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  216,040us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Junior subordinated debentures 19,082us-gaap_JuniorSubordinatedNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  0us-gaap_JuniorSubordinatedNotes
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other liabilities 1,552us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  278us-gaap_OtherLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total stockholders’ equity 454,506us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  215,762us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total liabilities and stockholders’ equity $ 475,140us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
  $ 216,040us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember