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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Investment in FHLB Stock) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended 24 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]        
Federal Home Loan Bank stock $ 27,036us-gaap_FederalHomeLoanBankStock $ 35,390us-gaap_FederalHomeLoanBankStock   $ 27,036us-gaap_FederalHomeLoanBankStock
Federal Home Loan Bank Stock, Par Value Per Share $ 100banr_FederalHomeLoanBankStockParValuePerShare     $ 100banr_FederalHomeLoanBankStockParValuePerShare
Proceeds from FHLB stock repurchase program 8,354us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock 1,315us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock 666us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock 9,700us-gaap_PaymentsForProceedsFromFederalHomeLoanBankStock
FHLB stock—dividend income 34us-gaap_DividendIncomeOperating 18us-gaap_DividendIncomeOperating 0us-gaap_DividendIncomeOperating  
Investment in Federal Home Loan Bank Stock [Member]        
Schedule of Equity Method Investments [Line Items]        
Federal Home Loan Bank Stock, Impairment $ 0us-gaap_ImpairmentOfInvestments
/ invest_InvestmentAxis
= us-gaap_InvestmentInFederalHomeLoanBankStockMember