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LONG-TERM DEBT (Narrative) (Details)
1 Months Ended 12 Months Ended
Oct. 20, 2020
USD ($)
Mar. 27, 2020
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Dec. 31, 2022
USD ($)
period
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]              
Long-term debt         $ 105,859,000 $ 105,616,000 $ 0
Interest on long-term debt         4,930,000 4,097,000 3,602,000
Maximum              
Debt Instrument [Line Items]              
Debt instrument, term   5 years          
CPB Capital Trust IV              
Debt Instrument [Line Items]              
Trust preferred securities issued       $ 30,000,000      
Variable rate basis       three-month LIBOR      
Interest Rate       2.45%      
Common securities issued to the Company       $ 900,000      
CPB Capital Trust V              
Debt Instrument [Line Items]              
Trust preferred securities issued     $ 20,000,000        
Variable rate basis     three-month LIBOR        
Interest Rate     1.87%        
Common securities issued to the Company     $ 600,000        
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral              
Debt Instrument [Line Items]              
Loans, net of ACL         3,280,000,000    
FHLB line of credit              
Debt Instrument [Line Items]              
Long-term debt         0 0  
Additional unused borrowings available         2,190,000,000    
Interest on long-term debt         0 0 $ 1,500,000
Subordinated debentures              
Debt Instrument [Line Items]              
Long-term debt         $ 51,547,000 51,547,000  
Number of consecutive quarterly periods for which payments of interest can be deferred without default or penalty (up to) | period         20    
Subordinated debentures | Maximum              
Debt Instrument [Line Items]              
Redemption period of trust preferred securities, the subordinated debentures and the common securities, following the occurrence of certain events         90 days    
Subordinated debentures | CPB Capital Trust IV              
Debt Instrument [Line Items]              
Long-term debt         $ 30,900,000    
Subordinated debentures | CPB Capital Trust V              
Debt Instrument [Line Items]              
Long-term debt         20,600,000    
Subordinated notes, net of issuance costs              
Debt Instrument [Line Items]              
Long-term debt         54,312,000 $ 54,069,000  
Subordinated notes, net of issuance costs | Subordinated Notes              
Debt Instrument [Line Items]              
Long-term debt         $ 54,300,000    
Debt face amount $ 55,000,000            
Debt instrument, term 10 years            
Stated interest rate, first five years 4.75%       0.0475%    
Unamortized debt issuance costs         $ 700,000    
Subordinated notes, net of issuance costs | Subordinated Notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 4.56%