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REAL ESTATE OWNED, HELD FOR SALE, NET (REO by Type and Geographic Location by State) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Real Estate Owned [Line Items]        
Total REO $ 3,352us-gaap_RealEstateAcquiredThroughForeclosure $ 4,044us-gaap_RealEstateAcquiredThroughForeclosure $ 15,778us-gaap_RealEstateAcquiredThroughForeclosure $ 42,965us-gaap_RealEstateAcquiredThroughForeclosure
Percent of total REO 100.00%banr_RealEstateOwnedNetPercentByGeography      
Washington [Member]        
Real Estate Owned [Line Items]        
Total REO 1,694us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_StatementGeographicalAxis
= stpr_WA
     
Percent of total REO 50.50%banr_RealEstateOwnedNetPercentByGeography
/ us-gaap_StatementGeographicalAxis
= stpr_WA
     
Oregon [Member]        
Real Estate Owned [Line Items]        
Total REO 1,626us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_StatementGeographicalAxis
= stpr_OR
     
Percent of total REO 48.50%banr_RealEstateOwnedNetPercentByGeography
/ us-gaap_StatementGeographicalAxis
= stpr_OR
     
Idaho [Member]        
Real Estate Owned [Line Items]        
Total REO 32us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_StatementGeographicalAxis
= stpr_ID
     
Percent of total REO 1.00%banr_RealEstateOwnedNetPercentByGeography
/ us-gaap_StatementGeographicalAxis
= stpr_ID
     
Land development- residential [Member]        
Real Estate Owned [Line Items]        
Total REO 1,562us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancialInstrumentAxis
= banr_ResidentialLandDevelopmentMember
     
Land development- residential [Member] | Washington [Member]        
Real Estate Owned [Line Items]        
Total REO 259us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancialInstrumentAxis
= banr_ResidentialLandDevelopmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_WA
     
Land development- residential [Member] | Oregon [Member]        
Real Estate Owned [Line Items]        
Total REO 1,271us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancialInstrumentAxis
= banr_ResidentialLandDevelopmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_OR
     
Land development- residential [Member] | Idaho [Member]        
Real Estate Owned [Line Items]        
Total REO 32us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancialInstrumentAxis
= banr_ResidentialLandDevelopmentMember
/ us-gaap_StatementGeographicalAxis
= stpr_ID
     
One- to four-family real estate [Member]        
Real Estate Owned [Line Items]        
Total REO 1,790us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancialInstrumentAxis
= banr_OneToFourFamilyMember
     
One- to four-family real estate [Member] | Washington [Member]        
Real Estate Owned [Line Items]        
Total REO 1,435us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancialInstrumentAxis
= banr_OneToFourFamilyMember
/ us-gaap_StatementGeographicalAxis
= stpr_WA
     
One- to four-family real estate [Member] | Oregon [Member]        
Real Estate Owned [Line Items]        
Total REO 355us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancialInstrumentAxis
= banr_OneToFourFamilyMember
/ us-gaap_StatementGeographicalAxis
= stpr_OR
     
One- to four-family real estate [Member] | Idaho [Member]        
Real Estate Owned [Line Items]        
Total REO $ 0us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FinancialInstrumentAxis
= banr_OneToFourFamilyMember
/ us-gaap_StatementGeographicalAxis
= stpr_ID