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INTANGIBLE ASSETS AND MORTGAGE SERVICING RIGHTS (Finite-Lived Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 06, 2015
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]        
Goodwill, acquired during period $ 21,148us-gaap_GoodwillAcquiredDuringPeriod $ 0us-gaap_GoodwillAcquiredDuringPeriod    
Finite-lived Intangible Assets [Roll Forward]        
Goodwill 21,148us-gaap_Goodwill 0us-gaap_Goodwill 21,148us-gaap_Goodwill 0us-gaap_Goodwill
Goodwill and other intangibles, net 27,258us-gaap_IntangibleAssetsNetIncludingGoodwill 2,831us-gaap_IntangibleAssetsNetIncludingGoodwill   2,449us-gaap_IntangibleAssetsNetIncludingGoodwill
Acquired Intangible Assets (Including Goodwill) 25,043banr_AcquiredIntangibleAssetsIncludingGoodwill 2,372banr_AcquiredIntangibleAssetsIncludingGoodwill    
Amortization (616)us-gaap_AmortizationOfIntangibleAssets (1,990)us-gaap_AmortizationOfIntangibleAssets    
Core Deposit Intangibles [Member]        
Finite-lived Intangible Assets [Roll Forward]        
CDI Balance, beginning of period 2,831us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
2,449us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
Additions through acquisitions 3,895us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
2,372us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
Amortization (616)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
(1,990)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
CDI Balance, end of period $ 6,110us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
$ 2,831us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember
   
Minimum [Member] | Core Deposit Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Asset, Useful Life 3 years      
Maximum [Member] | Core Deposit Intangibles [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Asset, Useful Life   8 years