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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Narrative (Details)
 1 Months Ended 6 Months Ended 9 Months Ended
Oct. 20, 2020
USD ($)
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Jun. 30, 2024
Sep. 30, 2024
USD ($)
period
Dec. 31, 2023
USD ($)
Debt Instrument [Line Items]            
Long term borrowings         $ 156,284,000 $ 156,102,000
Investment securities         1,329,570,000 1,279,548,000
Unamortized debt issuance costs         263,000 445,000
Subordinated debentures            
Debt Instrument [Line Items]            
Long term borrowings         $ 51,547,000 51,547,000
Number of periods interest can be deferred | period         20  
Subordinated notes, net of unamortized debt issuance costs            
Debt Instrument [Line Items]            
Long term borrowings         $ 54,737,000 54,555,000
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 debentures            
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 debentures            
Debt Instrument [Line Items]            
Long term borrowings         $ 20,600,000  
Maximum | Subordinated debentures            
Debt Instrument [Line Items]            
Redemption period         90 days  
Federal Home Loan Bank Borrowings            
Debt Instrument [Line Items]            
Line of Credit, maximum borrowing capacity         $ 1,850,000,000 1,930,000,000
Unused borrowings available         1,720,000,000 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         83,600,000 72,000,000.0
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Net loans and leases         $ 3,120,000,000 $ 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         $ 242,800,000 $ 285,800,000
Federal Reserve discount window line of credit | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Net loans and leases         130,100,000 135,100,000
Investment securities         187,300,000 196,700,000
Pacific Coast Bankers' Bank ("PCBB")            
Debt Instrument [Line Items]            
Unused borrowings available         $ 75,000,000 75,000,000
CPB Capital Trust IV | Junior Subordinated Debt | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate     2.45%      
CPB Capital 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%  
CPB Statutory Trust V | Junior Subordinated Debt | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.87%        
CPB Statutory 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, net of unamortized debt issuance costs            
Debt Instrument [Line Items]            
Long term borrowings         $ 54,700,000 $ 54,600,000
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 $ 400,000
Notes | Subordinated notes, net of unamortized debt issuance costs | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate 4.56%     4.56% 4.56%