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LONG-TERM DEBT (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Oct. 31, 2003
trust
Dec. 31, 2021
USD ($)
period
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2021
USD ($)
Jan. 31, 2019
USD ($)
Debt Instrument [Line Items]                
Long-term debt       $ 105,616,000 $ 105,385,000      
Federal Reserve Bank Stock, Loans Pledged       0     $ 65,900,000  
Federal Reserve Bank Stock       0     $ 65,900,000  
Interest expense       $ 4,097,000 $ 3,602,000 $ 4,080,000    
Number of wholly-owned statutory trusts created | trust     2          
CPB Capital Trust II                
Debt Instrument [Line Items]                
Trust preferred securities, redemption amount               $ 20,000,000
CPB Capital Trust III                
Debt Instrument [Line Items]                
Trust preferred securities, redemption amount           $ 20,000,000    
CPB Capital Trust IV                
Debt Instrument [Line Items]                
Trust preferred securities issued   $ 30,000,000            
Variable rate basis   three-month LIBOR            
Basis spread   2.45%   0.0245% 0.0245%      
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              
Basis spread 1.87%     0.0187% 0.0187%      
Common securities issued to the Company $ 600,000              
FHLB line of credit                
Debt Instrument [Line Items]                
Long-term debt       $ 0 $ 0      
Additional unused capacity available       1,800,000,000        
Real estate loans pledged as collateral       2,680,000,000        
Interest expense         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                
Debt Instrument [Line Items]                
Long-term debt       $ 54,069,000 $ 53,838,000