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FAIR VALUE ACCOUNTING AND MEASUREMENT (Valuation Technique) (Details) (Weighted Average [Member], Discounted cash flows [Member], Level 3 [Member])
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Junior Subordinated Debt [Member]    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 5.27%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_JuniorSubordinatedDebtMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
5.26%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_JuniorSubordinatedDebtMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
TPS Securities [Member]    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 5.27%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= banr_TrustPreferredSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
5.26%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= banr_TrustPreferredSecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
TRUP CDO Securities [Member]    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Discount rate 4.02%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= banr_TrustPreferredCollateralizedDebtObligationsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember
3.96%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= banr_TrustPreferredCollateralizedDebtObligationsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= us-gaap_IncomeApproachValuationTechniqueMember