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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Textuals) (Details) | Dec. 31, 2023 banking_location office
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Basis of Presentation and Summary of Significant Accounting Policies [Abstract] |
Number of offices | banking_location | 135
Subsidiary, Banner Bank [Member] |
Basis of Presentation and Summary of Significant Accounting Policies [Abstract] |
Number of production offices | office | 13
Minimum [Member] | Core Deposit Intangibles [Member] |
Basis of Presentation and Summary of Significant Accounting Policies [Abstract] |
Intangible asset, useful life | 8 years
Maximum [Member] | Core Deposit Intangibles [Member] |
Basis of Presentation and Summary of Significant Accounting Policies [Abstract] |
Intangible asset, useful life | 10 years

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- Definition Number of Loan Production Offices in Which Entity Operates + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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