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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
USD ($)
trust
Dec. 31, 2017
USD ($)
period
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
LONG-TERM DEBT            
Long-term debt       $ 92,785,000 $ 92,785,000  
Interest expense       3,479,000 3,005,000 $ 2,626,000
Number of wholly-owned statutory trusts created | trust     2      
CPB Capital Trust II            
LONG-TERM DEBT            
Trust preferred securities issued     $ 20,000,000      
Variable rate basis     three-month LIBOR      
Basis spread     2.85%      
Common securities issued to the Company     $ 600,000      
CPB Capital Trust III            
LONG-TERM DEBT            
Trust preferred securities issued     $ 20,000,000      
Variable rate basis     three-month LIBOR      
Basis spread     2.85%      
Common securities issued to the Company     $ 600,000      
CPB Capital Trust IV            
LONG-TERM DEBT            
Trust preferred securities issued   $ 30,000,000        
Variable rate basis   three-month LIBOR        
Basis spread   2.45%        
Common securities issued to the Company   $ 900,000        
CPB Capital Trust V            
LONG-TERM DEBT            
Trust preferred securities issued $ 20,000,000          
Variable rate basis three-month LIBOR          
Basis spread 1.87%          
Common securities issued to the Company $ 600,000          
FHLB line of credit            
LONG-TERM DEBT            
Additional unused capacity available       1,470,000,000    
Real estate loans pledged as collateral       2,020,000,000    
Interest expense       0 0 $ 0
Subordinated debentures            
LONG-TERM DEBT            
Long-term debt       $ 92,785,000 $ 92,785,000  
Number of consecutive quarterly periods for which payments of interest can be deferred without default or penalty (up to) | period       20    
Subordinated debentures | Maximum            
LONG-TERM DEBT            
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            
LONG-TERM DEBT            
Long-term debt       $ 20,600,000    
Subordinated debentures | CPB Capital Trust III            
LONG-TERM DEBT            
Long-term debt       20,600,000    
Subordinated debentures | CPB Capital Trust IV            
LONG-TERM DEBT            
Long-term debt       30,900,000    
Subordinated debentures | CPB Capital Trust V            
LONG-TERM DEBT            
Long-term debt       $ 20,600,000