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JUNIOR SUBORDINATED DEBENTURES AND MANDATORILY REDEEMABLE TRUST PREFERRED SECURITIES (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
subsidiary
Dec. 31, 2021
USD ($)
Dec. 31, 2020
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 $ 1,528,694,000 $ 1,440,694,000    
Repayment of junior subordinated debentures 50,518,000 8,248,000 $ 0  
Gain (Loss) on Extinguishment of Debt (765,000) (2,284,000) 0  
Loss on extinguishment of debt 793,000 2,284,000 $ 0  
Aggregate Liquidation Amount of Trust Preferred Securities [Member]        
Schedule of Trust Preferred Securities [Line Items]        
Repayment of junior subordinated debentures 50,500,000 $ 8,000,000    
Common Stock [Member]        
Schedule of Trust Preferred Securities [Line Items]        
Repayment of junior subordinated debentures $ 248,000      
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
Debentures Subject to Mandatory Redemption [Member]        
Schedule of Trust Preferred Securities [Line Items]        
Total TPS liability at par $ 89,178,000      
Fair value adjustment (14,321,000)      
Total TPS liability at fair value $ 74,857,000      
Current Interest Rate 5.99%      
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 4.90%      
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 6.42%      
Interest Rate Spread, Description Three-month LIBOR      
Interest Rate Spread 1.65%      
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 6.45%      
Interest Rate Spread, Description Three-month LIBOR      
Interest Rate Spread 1.68%      
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 5.12%      
Interest Rate Spread, Description Three-month LIBOR      
Interest Rate Spread 1.38%      
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 6.38%      
Interest Rate Spread, Description Three-month LIBOR      
Interest Rate Spread 1.62%      
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 6.26%      
Interest Rate Spread, Description Three-month LIBOR      
Interest Rate Spread 1.57%      
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] | Mission Oaks Statutory Trust One [Member]        
Schedule of Trust Preferred Securities [Line Items]        
Total TPS liability at par 232,000      
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] | 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] | 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 V [Member]        
Schedule of Trust Preferred Securities [Line Items]        
Total TPS liability at par 774,000      
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] | 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 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] | 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] | 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 V [Member]        
Schedule of Trust Preferred Securities [Line Items]        
Total TPS liability at par $ 25,000,000