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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Subordinated Debentures (Details) - Junior Subordinated Debt - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 9 Months Ended
Dec. 31, 2004
Sep. 30, 2004
Jun. 30, 2025
Sep. 30, 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%