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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details)
 1 Months Ended 3 Months Ended
Jan. 07, 2019
USD ($)
Dec. 17, 2018
USD ($)
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Oct. 31, 2003
USD ($)
trust
Mar. 31, 2019
USD ($)
period
Dec. 31, 2018
USD ($)
LONG-TERM DEBT              
Short-term borrowings           $ 179,000,000 $ 197,000,000
Long term borrowings           101,547,000 122,166,000
Number of wholly owned statutory trusts created | trust         2    
Federal Home Loan Bank Borrowings              
LONG-TERM DEBT              
Line of Credit, maximum borrowing capacity           1,720,000,000 1,430,000,000
Unused borrowings available           1,420,000,000 1,180,000,000
Short-term borrowings           179,000,000 197,000,000
Commercial real estate and commercial loans pledged as collateral           2,320,000,000  
Federal Reserve discount window line of credit              
LONG-TERM DEBT              
Unused borrowings available           70,600,000 73,900,000
Commercial real estate and commercial loans pledged as collateral           122,000,000 123,300,000
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       $ 20,000,000    
Trust Preferred Securities Issued Value, Held By Company 600,000            
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     $ 20,000,000.0    
Trust Preferred Securities Issued Value, Held By Company   600,000          
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 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%        
Federal Home Loan Bank Advances [Member]              
LONG-TERM DEBT              
Long term borrowings           $ 50,000,000 $ 50,000,000
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         $ 20,600,000  
Subordinated Debt [Member] | C P B Capital Trust I I I [Member]              
LONG-TERM DEBT              
Long term borrowings   $ 20,600,000       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