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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Narrative (Details)
 1 Months Ended 6 Months Ended
Oct. 20, 2020
USD ($)
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Jun. 30, 2023
USD ($)
period
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Debt Instrument [Line Items]            
Short-term borrowings       $ 0 $ 5,000,000  
Long term borrowings       155,981,000 105,859,000  
Investment securities       1,314,017,000 1,336,677,000  
Unamortized debt issuance costs       $ (566,000) (688,000)  
Subordinated Debt            
Debt Instrument [Line Items]            
Number of periods interest can be deferred | period       20    
C P B Capital Trust I V            
Debt Instrument [Line Items]            
Trust preferred securities issued value     $ 30,000,000      
Trust preferred securities, variable rate basis     three-month LIBOR      
Trust preferred securities, basis spread on variable rate     2.45%      
Common securities issued     $ 900,000      
C P B Capital Trust I V | Subordinated Debt            
Debt Instrument [Line Items]            
Long term borrowings       $ 30,900,000    
C P B Capital Trust V            
Debt Instrument [Line Items]            
Trust preferred securities issued value   $ 20,000,000        
Trust preferred securities, variable rate basis   three-month LIBOR        
Trust preferred securities, basis spread on variable rate   1.87%        
Common securities issued   $ 600,000        
C P B Capital Trust V | Subordinated Debt            
Debt Instrument [Line Items]            
Long term borrowings       $ 20,600,000    
Maximum | Subordinated Debt            
Debt Instrument [Line Items]            
Redemption period       90 days    
Federal Home Loan Bank Borrowings            
Debt Instrument [Line Items]            
Line of Credit, maximum borrowing capacity         2,230,000,000 $ 2,060,000,000.00
Unused borrowings available       $ 1,980,000,000 2,190,000,000  
Short-term borrowings         5,000,000  
Letters of Credit, outstanding       36,000,000 36,000,000  
Long term borrowings       50,000,000    
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Net loans and leases       $ 3,200,000,000    
Federal Home Loan Bank Borrowings | Minimum            
Debt Instrument [Line Items]            
Long term borrowings, interest rate       4.02%    
Federal Home Loan Bank Borrowings | Maximum            
Debt Instrument [Line Items]            
Long term borrowings, interest rate       4.62%    
Federal Reserve discount window line of credit            
Debt Instrument [Line Items]            
Unused borrowings available       $ 169,300,000 75,900,000  
Federal Reserve discount window line of credit | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Net loans and leases       138,200,000 125,000,000  
Investment securities       72,600,000 0  
Notes | Subordinated notes            
Debt Instrument [Line Items]            
Long term borrowings       $ 54,400,000    
Debt face amount $ 55,000,000          
Debt instrument, term 10 years          
Stated interest rate, first five years 4.75%     0.0475%    
Unamortized debt issuance costs       $ (600,000)    
Notes | Subordinated notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.56%          
Pacific Coast Bankers' Bank ("PCBB")            
Debt Instrument [Line Items]            
Line of Credit, maximum borrowing capacity         100,000,000 50,000,000
Wells Fargo            
Debt Instrument [Line Items]            
Line of Credit, maximum borrowing capacity         $ 25,000,000 $ 25,000,000