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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 ($)
Jun. 30, 2025
Sep. 30, 2025
USD ($)
period
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]            
Long term borrowings         $ 131,527,000 $ 156,345,000
Investment securities         1,329,569,000 1,334,588,000
Junior 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         $ 54,980,000 54,798,000
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 | Junior 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 | Junior subordinated debentures            
Debt Instrument [Line Items]            
Long term borrowings         $ 20,600,000  
Maximum | Junior 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         $ 1,590,000,000 1,760,000,000
Unused borrowings available         1,470,000,000 1,630,000,000
FHLB advances and other short-term borrowings         0 0
Long term borrowings         25,000,000 25,000,000
Letters of Credit, outstanding         95,600,000 83,600,000
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Net loans and leases         $ 2,790,000,000 $ 3,140,000,000
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         $ 209,200,000 $ 232,100,000
Federal Reserve discount window line of credit | Asset Pledged as Collateral            
Debt Instrument [Line Items]            
Net loans and leases         100,100,000 128,300,000
Investment securities         174,800,000 184,300,000
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            
Debt Instrument [Line Items]            
Basis spread on variable rate     2.45%      
CPB Statutory Trust V | Junior Subordinated Debt            
Debt Instrument [Line Items]            
Basis spread on variable rate   1.87%        
Notes | Subordinated notes, net of unamortized debt issuance costs            
Debt Instrument [Line Items]            
Long term borrowings         $ 55,000,000.0 $ 54,800,000
Basis spread on variable rate 4.56%     4.56% 4.56%  
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         $ 20,000 $ 200,000