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INTEREST-BEARING DEPOSITS AND SECURITIES (Textual) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
security
Mar. 31, 2014
security
Dec. 31, 2013
security
Dec. 31, 2014
security
Sep. 30, 2013
security
Trading Securities [Abstract]          
Trading Securities, Number of Securities Sold 1banr_TradingSecuritiesNumberOfSecuritiesSold 3banr_TradingSecuritiesNumberOfSecuritiesSold      
Trading Securities, Sale Proceeds $ 2,290,000us-gaap_ProceedsFromPaymentsForTradingSecurities $ 2,387,000us-gaap_ProceedsFromPaymentsForTradingSecurities      
Trading Securities, Realized Gain (Loss) (642,000)us-gaap_TradingSecuritiesRealizedGainLoss 1,000us-gaap_TradingSecuritiesRealizedGainLoss      
Trading Securities, OTTI (Recovery) Charges 0banr_OtherThanTemporaryImpairmentLossesRecoveriesInvestmentsPortionRecognizedInEarningsTradingSecurities 0banr_OtherThanTemporaryImpairmentLossesRecoveriesInvestmentsPortionRecognizedInEarningsTradingSecurities      
Trading Securities, Number of Securities on Nonaccrual Status 0banr_TradingSecuritiesNumberOfSecuritiesInNonaccrualStatus   0banr_TradingSecuritiesNumberOfSecuritiesInNonaccrualStatus    
Available-for-sale Securities [Abstract]          
Available-for-sale Securities, Number of Securities Sold 42banr_AvailableForSaleSecuritiesGrossRealizedGainsLossesNumberOfSecuritiesSold 6banr_AvailableForSaleSecuritiesGrossRealizedGainsLossesNumberOfSecuritiesSold      
Available-for-sale Securities, Sale Proceeds 22,300,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds 28,200,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds      
Available-for-sale Securities, Gross Realized Gain (Loss) 103,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet 34,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet      
Available-for-sale Securities, Number of Securities in Unrealized Loss Position 59us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1     94us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1  
Available-for-sale Securities, OTTI Charges 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities   0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities    
Available-for-sale Securities, Number of Securities in Nonaccrual Status 0banr_AvailableforsaleSecuritiesNumberofSecuritiesinNonaccrualStatus       0banr_AvailableforsaleSecuritiesNumberofSecuritiesinNonaccrualStatus
Held-to-maturity Securities [Abstract]          
Held-to-maturity Securities, Number of Securities Sold 0banr_HeldToMaturitySecuritiesRealizedGainLossNumberOfSecuritiesSold   0banr_HeldToMaturitySecuritiesRealizedGainLossNumberOfSecuritiesSold    
Held-to-maturity Securities, Number of Securities in Unrealized Loss Position 10us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions     25us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions  
Held-to-maturity Securities, OTTI Charges $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities   $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities    
Held-to-maturity Securities, Number of Securities in Nonaccrual Status 0banr_HeldToMaturitySecuritiesNumberOfSecuritiesInNonaccrualStatus   0banr_HeldToMaturitySecuritiesNumberOfSecuritiesInNonaccrualStatus