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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details)
 1 Months Ended 6 Months Ended
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Oct. 31, 2003
USD ($)
trust
Jun. 30, 2018
USD ($)
period
Dec. 31, 2017
USD ($)
LONG-TERM DEBT          
Short-term borrowings       $ 87,000,000 $ 32,000,000
Long term borrowings       92,785,000 92,785,000
Number of wholly owned statutory trusts created | trust     2    
Federal Home Loan Bank Borrowings          
LONG-TERM DEBT          
Line of Credit, maximum borrowing capacity       1,620,000,000 1,500,000,000
Unused borrowings available       1,530,000,000 1,470,000,000
Short-term borrowings       87,000,000 32,000,000
Long term borrowings       0 0
Commercial real estate and commercial loans pledged as collateral       2,180,000,000  
Federal Reserve discount window line of credit          
LONG-TERM DEBT          
Unused borrowings available       71,500,000 73,000,000
Commercial real estate and commercial loans pledged as collateral       $ 125,800,000 $ 129,200,000
C P B Capital Trust I I [Member]          
LONG-TERM DEBT          
Common securities issued     $ 600,000.0    
Trust preferred securities issued value     $ 20,000,000    
Trust preferred securities, variable rate basis     three-month LIBOR    
Trust preferred securities, basis spread on variable rate     2.85%    
C P B Capital Trust I I I [Member]          
LONG-TERM DEBT          
Common securities issued     $ 600,000.0    
Trust preferred securities issued value     $ 20,000,000.0    
Trust preferred securities, variable rate basis     three-month LIBOR    
Trust preferred securities, basis spread on variable rate     2.85%    
C P B Capital Trust I V [Member]          
LONG-TERM DEBT          
Common securities issued   $ 900,000.0      
Trust preferred securities issued value   $ 30,000,000.0      
Trust preferred securities, variable rate basis   three-month LIBOR      
Trust preferred securities, basis spread on variable rate   2.45%      
C P B Capital Trust V [Member]          
LONG-TERM DEBT          
Common securities issued $ 600,000.0        
Trust preferred securities issued value $ 20,000,000.0        
Trust preferred securities, variable rate basis three-month LIBOR        
Trust preferred securities, basis spread on variable rate 1.87%        
Subordinated Debt [Member]          
LONG-TERM DEBT          
Number of periods interest can be deferred | period       20  
Subordinated Debt [Member] | C P B Capital Trust I I [Member]          
LONG-TERM DEBT          
Long term borrowings       $ 20,600,000  
Subordinated Debt [Member] | C P B Capital Trust I I I [Member]          
LONG-TERM DEBT          
Long term borrowings       20,600,000  
Subordinated Debt [Member] | C P B Capital Trust I V [Member]          
LONG-TERM DEBT          
Long term borrowings       30,900,000  
Subordinated Debt [Member] | C P B Capital Trust V [Member]          
LONG-TERM DEBT          
Long term borrowings       $ 20,600,000  
Maximum [Member] | Subordinated Debt [Member]          
LONG-TERM DEBT          
Redemption period       90 days