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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Newly Restructured Loans) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 contract | Mar. 31, 2021 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Commitments to advance funds related to TDRs, maximum additional amounts | $ |  | $ 0.0
Number of Contracts | contract | 2 |

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- Definition Financing Receivable, Modifications, Commitments to Advance Funds + References No definition available. + Details
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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

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration