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INTEREST-BEARING DEPOSITS AND SECURITIES (Held-to-Maturity Securities with Continuous Loss Position) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 Months, Fair Value $ 7,263us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue $ 10,839us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Less than 12 Months, Unrealized Losses (85)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss (51)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
12 Months or More, Fair Value 0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 1,719us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
12 Months or More, Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss (23)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Total Fair Value 7,263us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue 12,558us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Total Unrealized Losses (85)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss (74)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
U.S. Government and agency obligations [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 Months, Fair Value   0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasuryAndGovernmentMember
Less than 12 Months, Unrealized Losses   0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasuryAndGovernmentMember
12 Months or More, Fair Value   1,127us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasuryAndGovernmentMember
12 Months or More, Unrealized Losses   (19)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasuryAndGovernmentMember
Total Fair Value   1,127us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasuryAndGovernmentMember
Total Unrealized Losses   (19)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasuryAndGovernmentMember
Total municipal bonds [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 Months, Fair Value   9,821us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember
Less than 12 Months, Unrealized Losses   (44)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember
12 Months or More, Fair Value   592us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember
12 Months or More, Unrealized Losses   (4)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember
Total Fair Value   10,413us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember
Total Unrealized Losses   (48)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_MunicipalBondsMember
Taxable municipal bonds [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 Months, Fair Value   724us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
Less than 12 Months, Unrealized Losses   (1)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
12 Months or More, Fair Value   0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
12 Months or More, Unrealized Losses   0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
Total Fair Value   724us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
Total Unrealized Losses   (1)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_TaxableMunicipalBondsMember
Tax exempt municipal bonds [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 Months, Fair Value 6,892us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
9,097us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
Less than 12 Months, Unrealized Losses (82)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
(43)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
12 Months or More, Fair Value 0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
592us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
12 Months or More, Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
(4)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
Total Fair Value 6,892us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
9,689us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
Total Unrealized Losses (82)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
(47)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_NontaxableMunicipalBondsMember
1-4 residential agency guaranteed [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Less than 12 Months, Fair Value 371us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
1,018us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
Less than 12 Months, Unrealized Losses (3)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
(7)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
12 Months or More, Fair Value 0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
12 Months or More, Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
0us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
Total Fair Value 371us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
1,018us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
Total Unrealized Losses $ (3)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember
$ (7)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= banr_OneToFourResidentialAgencyGuaranteedMember