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SHORT-TERM BORROWINGS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SHORT-TERM BORROWINGS      
Maximum borrowing capacity $ 1,220,000,000.00    
Additional unused borrowings available 1,150,000,000    
Amount outstanding at December 31 69,000,000 $ 38,000,000 $ 8,015,000
Interest expense on short-term borrowings 254,000 92,000 6,000
Average amount outstanding during year 92,045,000 31,732,000 1,988,000
Highest month-end balance during year $ 157,000,000 $ 102,000,000 $ 28,000,000
Weighted average interest rate on balances outstanding at December 31 0.35% 0.25% 0.23%
Weighted average interest rate during year 0.28% 0.29% 0.32%
Federal Reserve discount window line of credit | Central Bank      
SHORT-TERM BORROWINGS      
Additional unused borrowings available $ 40,800,000 $ 33,300,000  
Commercial real estate and commercial loans pledged as collateral $ 87,300,000 $ 72,900,000