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LONG-TERM DEBT (Details)
1 Months Ended 12 Months Ended
Jan. 07, 2019
USD ($)
Nov. 13, 2018
USD ($)
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Oct. 31, 2003
USD ($)
trust
Dec. 31, 2019
USD ($)
period
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                
Long-term debt           $ 101,547,000 $ 122,166,000  
Interest expense           4,080,000 4,556,000 $ 3,479,000
Number of wholly-owned statutory trusts created | trust         2      
CPB Capital Trust II                
Debt Instrument [Line Items]                
Trust preferred securities issued   $ 20,000,000.0     $ 20,000,000.0      
Variable rate basis         three-month London Interbank Offered Rate ("LIBOR")      
Basis spread         2.85%      
Common securities issued to the Company         $ 600,000      
CPB Capital Trust III                
Debt Instrument [Line Items]                
Trust preferred securities issued         $ 20,000,000.0      
Variable rate basis         three-month LIBOR      
Basis spread         2.85%      
Trust Preferred Securities Redeemed Value         $ 600,000      
CPB Capital Trust IV                
Debt Instrument [Line Items]                
Trust preferred securities issued       $ 30,000,000.0        
Variable rate basis       three-month LIBOR        
Basis spread       2.45%        
Common securities issued to the Company       $ 900,000        
CPB Capital Trust V                
Debt Instrument [Line Items]                
Trust preferred securities issued     $ 20,000,000.0          
Variable rate basis     three-month LIBOR          
Basis spread     1.87%          
Common securities issued to the Company     $ 600,000          
FHLB line of credit                
Debt Instrument [Line Items]                
Long-term debt           50,000,000 50,000,000  
Additional unused capacity available           1,570,000,000    
Real estate loans pledged as collateral           2,480,000,000    
Interest expense           1,600,000 200,000 $ 0
Subordinated debentures                
Debt Instrument [Line Items]                
Long-term debt           $ 51,547,000 $ 72,166,000  
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 II                
Debt Instrument [Line Items]                
Long-term debt   $ 600,000       $ 20,600,000    
Subordinated debentures | CPB Capital Trust III                
Debt Instrument [Line Items]                
Long-term debt           20,600,000    
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    
Trust II [Member]                
Debt Instrument [Line Items]                
Long-term debt $ 20,600,000              
Trust preferred securities issued $ 20,000,000.0              
Variable rate basis three-month LIBOR              
Basis spread 2.85%              
Trust Preferred Securities Redeemed Value         $ 600,000