v3.26.1
SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Subordinated Debentures (Details) - Junior Subordinated Debt - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2004
Sep. 30, 2004
Mar. 31, 2026
Jun. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]          
Subordinated Debentures       $ 51,547 $ 51,547
CPB Capital Trust IV ("Trust IV")          
Debt Instrument [Line Items]          
Subordinated Debentures       $ 30,928 30,928
Interest Rate   2.45%      
CPB Capital Trust IV ("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 ("Trust IV") | Tenor Spread Adjustment          
Debt Instrument [Line Items]          
Interest Rate     2.45% 2.45%  
CPB Statutory Trust V ("Trust V")          
Debt Instrument [Line Items]          
Subordinated Debentures       $ 20,619 $ 20,619
Interest Rate 1.87%        
CPB Statutory Trust V ("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 ("Trust V") | Tenor Spread Adjustment          
Debt Instrument [Line Items]          
Interest Rate     1.87% 1.87%