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EMPLOYEE STOCK OWNERSHIP PLAN AND TRUST (Details) (Employer Stock Ownership Plan and Trust [Member], USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 1995
Employer Stock Ownership Plan and Trust [Member]
     
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]      
Employer loan, original amount     $ 8,700,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= banr_EmployerStockOwnershipPlanAndTrustMember
ESOP contributions 0us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= banr_EmployerStockOwnershipPlanAndTrustMember
0us-gaap_EmployeeStockOwnershipPlanESOPCashContributionsToESOP
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= banr_EmployerStockOwnershipPlanAndTrustMember
 
ESOP payments $ 0us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= banr_EmployerStockOwnershipPlanAndTrustMember
$ 0us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
/ us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis
= banr_EmployerStockOwnershipPlanAndTrustMember