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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Troubled Debt Restructuring) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring | $ 4.4 | $ 5.5
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
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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
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- Definition Amount of financing receivable modified as troubled debt restructuring. + 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 https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
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