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FAIR VALUE ACCOUNTING AND MEASUREMENT (Non-recurring Basis) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans individually evaluated for impairment $ 40,085,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment $ 53,009,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Write-downs on loans individually evaluated for impairment 1,189,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs 1,528,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Allowance on loans individually evaluated for impairment 2,606,000us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 4,693,000us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Loans collectively evaluated for impairment 4,069,059,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment 3,469,903,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Allowance on loans collectively evaluated for impairment 72,759,000us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment 69,678,000us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Nonrecurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Classifed loans 80,000,000banr_LoansReceivableClassifedLoans
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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Write-downs on loans individually evaluated for impairment 3,000,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Impairment of real estate owned $ 0us-gaap_ImpairmentOfRealEstate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
$ 37,000us-gaap_ImpairmentOfRealEstate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember