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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 20, 2020
USD ($)
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Mar. 31, 2024
Jun. 30, 2024
USD ($)
period
Dec. 31, 2023
USD ($)
Debt Instrument [Line Items]            
Long term borrowings         $ 156,223,000 $ 156,102,000
Investment securities         1,292,586,000 1,279,548,000
Unamortized debt issuance costs         $ 324,000 445,000
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      
Common securities issued to company     $ 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        
Common securities issued to company   $ 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         $ 1,870,000,000 1,930,000,000
Unused borrowings available         1,740,000,000 1,810,000,000
FHLB advances and other short-term borrowings         0 0
Long term borrowings         50,000,000 50,000,000
Letters of Credit, outstanding         79,000,000.0 72,000,000.0
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Net loans and leases         $ 3,140,000,000 $ 3,160,000,000
Federal Home Loan Bank Borrowings | Minimum            
Debt Instrument [Line Items]            
Long term borrowings, interest rate         4.02% 4.02%
Federal Home Loan Bank Borrowings | Maximum            
Debt Instrument [Line Items]            
Long term borrowings, interest rate         4.62% 4.62%
Federal Reserve discount window line of credit            
Debt Instrument [Line Items]            
Unused borrowings available         $ 238,300,000 $ 285,800,000
Federal Reserve discount window line of credit | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Net loans and leases         131,800,000 135,100,000
Investment securities         190,600,000 196,700,000
Pacific Coast Bankers' Bank ("PCBB")            
Debt Instrument [Line Items]            
Unused borrowings available         $ 75,000,000 $ 75,000,000
Trust IV | Junior Subordinated Debt | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate     2.45%      
Trust IV | Junior Subordinated Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate       0.26% 0.26%  
Trust V | Junior Subordinated Debt | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.87%        
Trust V | Junior Subordinated Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate       0.26% 0.26%  
Notes | Subordinated notes            
Debt Instrument [Line Items]            
Long term borrowings         $ 54,700,000  
Debt face amount $ 55,000,000          
Debt instrument, term 10 years          
Stated interest rate, first five years 4.75%       4.75% 4.75%
Unamortized debt issuance costs         $ 300,000  
Notes | Subordinated notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.56%     4.56% 4.56%