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JUNIOR SUBORDINATED DEBENTURES AND MANDATORILY REDEEMABLE TRUST PREFERRED SECURITIES (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) subsidiary | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2020 USD ($)
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Number of wholly-owned Grantor Trusts | subsidiary | 5 |  |  |
Grantor trusts amount of tier one risk based capital | $ 1,650,872,000 | $ 1,528,694,000 |  |
Repayment of junior subordinated debentures | 0 | 50,518,000 | $ 8,248,000 |
Loss on extinguishment of debt | $ 0 | 793,000 | $ 2,284,000 |
Aggregate Liquidation Amount of Trust Preferred Securities [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Repayment of junior subordinated debentures |  | $ 50,500,000 |  |
Junior Subordinated Debt [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Long-term Debt, Gross |  |  |  | $ 100,000,000
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |  |  |
Balance outstanding |  |  |  | $ 98,100,000
Subordinated Borrowing, Interest Rate | 5.00% |  |  |
Junior Subordinated Debt [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Interest Rate Spread | 48900.00% |  |  |
Aggregate Liquidation Amount of Trust Preferred Securities [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | $ 86,500,000 |  |  |
Aggregate Liquidation Amount of Trust Preferred Securities [Member] | Banner Capital Trust V [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 25,000,000 |  |  |
Aggregate Liquidation Amount of Trust Preferred Securities [Member] | Banner Capital Trust VI [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 25,000,000 |  |  |
Aggregate Liquidation Amount of Trust Preferred Securities [Member] | Banner Capital Trust VII [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 25,000,000 |  |  |
Aggregate Liquidation Amount of Trust Preferred Securities [Member] | Greater Sacramento Bancorp Statutory Trust Two [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 4,000,000 |  |  |
Aggregate Liquidation Amount of Trust Preferred Securities [Member] | Mission Oaks Statutory Trust One [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 7,500,000 |  |  |
Aggregate Liquidation Amount of Common Capital Securities [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 2,678,000 |  |  |
Aggregate Liquidation Amount of Common Capital Securities [Member] | Banner Capital Trust V [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 774,000 |  |  |
Aggregate Liquidation Amount of Common Capital Securities [Member] | Banner Capital Trust VI [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 774,000 |  |  |
Aggregate Liquidation Amount of Common Capital Securities [Member] | Banner Capital Trust VII [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 774,000 |  |  |
Aggregate Liquidation Amount of Common Capital Securities [Member] | Greater Sacramento Bancorp Statutory Trust Two [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 124,000 |  |  |
Aggregate Liquidation Amount of Common Capital Securities [Member] | Mission Oaks Statutory Trust One [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 232,000 |  |  |
Debentures Subject to Mandatory Redemption [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | 89,178,000 |  |  |
Fair value adjustment | (22,765,000) |  |  |
Total TPS liability at fair value | $ 66,413,000 |  |  |
Current Interest Rate | 7.19% |  |  |
Debentures Subject to Mandatory Redemption [Member] | Banner Capital Trusts [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Grantor trusts amount of tier one risk based capital | $ 86,500,000 |  |  |
Grantor trusts percentage of tier one risk based capital | 4.50% |  |  |
Debentures Subject to Mandatory Redemption [Member] | Banner Capital Trust V [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | $ 25,774,000 |  |  |
Current Interest Rate | 7.21% |  |  |
Interest Rate Spread, Description | Three-month SOFR |  |  |
Interest Rate Spread | 1.83% |  |  |
Debentures Subject to Mandatory Redemption [Member] | Banner Capital Trust VI [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | $ 25,774,000 |  |  |
Current Interest Rate | 7.26% |  |  |
Interest Rate Spread, Description | Three-month SOFR |  |  |
Interest Rate Spread | 1.88% |  |  |
Debentures Subject to Mandatory Redemption [Member] | Banner Capital Trust VII [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | $ 25,774,000 |  |  |
Current Interest Rate | 7.04% |  |  |
Interest Rate Spread, Description | Three-month SOFR |  |  |
Interest Rate Spread | 1.64% |  |  |
Debentures Subject to Mandatory Redemption [Member] | Greater Sacramento Bancorp Statutory Trust Two [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | $ 4,124,000 |  |  |
Current Interest Rate | 7.33% |  |  |
Interest Rate Spread, Description | Three-month SOFR |  |  |
Interest Rate Spread | 1.94% |  |  |
Debentures Subject to Mandatory Redemption [Member] | Mission Oaks Statutory Trust One [Member] |  |  |  |
Schedule of Trust Preferred Securities [Line Items] |  |  |  |
Total TPS liability at par | $ 7,732,000 |  |  |
Current Interest Rate | 7.30% |  |  |
Interest Rate Spread, Description | Three-month SOFR |  |  |
Interest Rate Spread | 1.91% |  |  |

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