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FAIR VALUE ACCOUNTING AND MEASUREMENT (Commitments) (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Commitments to originate loans held for sale [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund loans, notional amount $ 62,093,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= banr_LoansHeldForSaleOriginationCommitmentsMember		 $ 29,851,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= banr_LoansHeldForSaleOriginationCommitmentsMember
Commitments to sell loans [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund loans, notional amount 21,040,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentstoSellLoansSecuredbyonetofourResidentialPropertiesMember		 8,714,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentstoSellLoansSecuredbyonetofourResidentialPropertiesMember
Commitments to originate loans [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund loans, notional amount 41,880,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanOriginationCommitmentsMember		 20,988,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanOriginationCommitmentsMember
Commitment to fund loans [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund loans, notional amount 1,328,000,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentToFundLoansMember		 1,197,000,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentToFundLoansMember
Commitment to fund loans [Member] | Level 2 [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund loans, carrying value 0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentToFundLoansMember		 0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentToFundLoansMember
Commitments to purchase securities [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund loans, notional amount 0us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentToPurchaseSecuritiesMember		 0us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentToPurchaseSecuritiesMember
Number of commitments to purchase securities 0banr_FairValueDisclosureOffBalanceSheetRisksNumberOfCommitmentsToPurchaseSecurities
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentToPurchaseSecuritiesMember		 0banr_FairValueDisclosureOffBalanceSheetRisksNumberOfCommitmentsToPurchaseSecurities
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentToPurchaseSecuritiesMember
Commitments to sell mortgage backed securities [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Commitments to fund loans, notional amount $ 43,572,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentsToSellMortgageBackedSecuritiesMember		 $ 25,000,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
/ us-gaap_FinancialInstrumentAxis
= banr_CommitmentsToSellMortgageBackedSecuritiesMember