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v3.22.1

LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Newly Restructured Loans) (Details) $ in Millions | Mar. 31, 2022 USD ($)
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Financing Receivable, Troubled Debt Restructuring [Line Items] |
Commitments to advance funds related to TDRs, maximum additional amounts | $ 0.0

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- Definition Financing Receivable, Modifications, Commitments to Advance Funds + References No definition available. + Details
Name: | banr_FinancingReceivableModificationsCommitmentsToAdvanceFunds
Namespace Prefix: | banr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration