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DEPOSITS DEPOSITS (Textual) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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CDs at or Above FDIC Limit [Line Items] |  |
Time Deposits, at or Above FDIC Insurance Limit |  | $ 184,500
Certificate of Deposit [Member] |  |
CDs at or Above FDIC Limit [Line Items] |  |
Time Deposits, at or Above FDIC Insurance Limit | $ 164,700 |

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- Definition CDs at or Above FDIC Limit [Line Items] + References No definition available. + Details
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Namespace Prefix: | banr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |