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SHORT-TERM BORROWINGS (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SHORT-TERM BORROWINGS      
Maximum borrowing capacity $ 1,412,000,000.000    
Additional unused borrowings available 1,280,000,000    
Amount outstanding at December 31 135,000,000 $ 69,000,000 $ 38,000,000
Interest expense on short-term borrowings 578,000 254,000 92,000
Average amount outstanding during year 110,928,000 92,045,000 31,732,000
Highest month-end balance during year $ 226,000,000 $ 157,000,000 $ 102,000,000
Weighted average interest rate on balances outstanding at December 31 0.74% 0.35% 0.25%
Weighted average interest rate during year 0.52% 0.28% 0.29%
Federal Reserve discount window line of credit | Central Bank      
SHORT-TERM BORROWINGS      
Additional unused borrowings available $ 63,700,000 $ 40,800,000  
Commercial real estate and commercial loans pledged as collateral $ 129,900,000 $ 87,300,000