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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Subordinated Debentures (Details) - Junior Subordinated Debt - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2004
Sep. 30, 2004
Mar. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]        
Subordinated Debentures     $ 51,547 $ 51,547
CPB Capital Trust IV        
Debt Instrument [Line Items]        
Subordinated Debentures     $ 30,928 $ 30,928
Interest Rate   2.45%    
CPB Capital Trust IV | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate        
Debt Instrument [Line Items]        
Interest Rate     0.26% 0.26%
CPB Capital Trust IV | Tenor Spread Adjustment        
Debt Instrument [Line Items]        
Interest Rate     2.45% 2.45%
CPB Statutory Trust V        
Debt Instrument [Line Items]        
Subordinated Debentures     $ 20,619 $ 20,619
Interest Rate 1.87%      
CPB Statutory Trust V | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate        
Debt Instrument [Line Items]        
Interest Rate     0.26% 0.26%
CPB Statutory Trust V | Tenor Spread Adjustment        
Debt Instrument [Line Items]        
Interest Rate     1.87% 1.87%