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PREFERRED STOCK AND RELATED WARRANT (Details) (USD $)
0 Months Ended
Nov. 21, 2008
Dec. 31, 2014
Dec. 31, 2013
Mar. 29, 2012
Class of Stock [Line Items]        
Common stock, par value per share   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare  
Preferred stock issued, value   $ 0us-gaap_PreferredStockValue $ 0us-gaap_PreferredStockValue  
U.S. Treasury Capital Purchase Program [Member] | Series A Preferred Stock [Member]        
Class of Stock [Line Items]        
Preferred stock, shares issued 124,000us-gaap_PreferredStockSharesIssued
/ banr_EquityTransactionTypeAxis
= banr_USTreasuryCapitalPurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
     
Preferred stock, liquidation value per share $ 1,000us-gaap_PreferredStockRedemptionPricePerShare
/ banr_EquityTransactionTypeAxis
= banr_USTreasuryCapitalPurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
     
Preferred stock aggregate liquidation preference 124,000,000banr_PreferredStockAggregateLiquidationPreference
/ banr_EquityTransactionTypeAxis
= banr_USTreasuryCapitalPurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
     
Preferred stock issued, value       124,000,000us-gaap_PreferredStockValue
/ banr_EquityTransactionTypeAxis
= banr_USTreasuryCapitalPurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
U.S. Treasury Capital Purchase Program [Member] | Common Stock [Member] | Warrant [Member]        
Class of Stock [Line Items]        
U.S. Treasury warrants, term (in years) 10 years      
Warrant, option to purchase common stock (in shares) 243,998us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
/ banr_EquityTransactionTypeAxis
= banr_USTreasuryCapitalPurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
Common stock, par value per share $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
/ banr_EquityTransactionTypeAxis
= banr_USTreasuryCapitalPurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
U.S. Treasury warrants, exercise price per share $ 76.23banr_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsPerShare
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
/ banr_EquityTransactionTypeAxis
= banr_USTreasuryCapitalPurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
U.S. Treasury warrants, aggregate exercise price $ 18,600,000banr_ClassOfWarrantOrRightAggregateExercisePriceOfWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
/ banr_EquityTransactionTypeAxis
= banr_USTreasuryCapitalPurchaseProgramMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember