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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 20, 2020
USD ($)
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Mar. 31, 2025
USD ($)
period
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]          
Long term borrowings       $ 131,405,000 $ 156,345,000
Investment securities       1,370,067,000 1,334,588,000
Unamortized debt issuance costs       142,000 202,000
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       $ 54,858,000 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 | 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       $ 1,760,000,000 1,760,000,000
Unused borrowings available       1,660,000,000 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       83,600,000 83,600,000
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral          
Debt Instrument [Line Items]          
Net loans and leases       $ 3,130,000,000 $ 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       $ 231,700,000 $ 232,100,000
Federal Reserve discount window line of credit | Asset Pledged as Collateral          
Debt Instrument [Line Items]          
Net loans and leases       125,000,000.0 128,300,000
Investment securities       181,600,000 184,300,000
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       $ 54,900,000 $ 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       $ 100,000 $ 200,000