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BUSINESS COMBINATIONS BUSINESS COMBINATIONS (Schedule of Components of Acquisition) (Details) (Six Oregon Branches [Member], USD $)
Jun. 20, 2014
Six Oregon Branches [Member]
 
ASSETS  
Cash $ 127,557,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember
Loans receivable (contractual amount of $88.3 million) 87,923,000us-gaap_BusinessCombinationAcquiredReceivablesFairValue
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember
Property and equipment 3,079,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember
Core deposit intangible 2,372,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember
Other assets 275,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember
Total assets 221,206,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember
LIABILITIES  
Deposits 212,085,000banr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedDeposits
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember
Other liabilities 42,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember
Total liabilities 212,127,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember
Net assets acquired (Acquisition bargain purchase gain) 9,079,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember
Business Combination, Acquired Receivables, Gross Contractual Amount $ 88,300,000us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount
/ us-gaap_BusinessAcquisitionAxis
= banr_SixOregonBranchesMember