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SHORT-TERM BORROWINGS (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SHORT-TERM BORROWINGS      
Maximum borrowing capacity $ 1,840,000,000    
Amount outstanding at December 31 150,000,000 $ 197,000,000.0 $ 32,000,000
Interest expense on short-term borrowings 4,285,000 1,236,000 183,000
Average amount outstanding during year 185,909,000 50,630,000 15,531,000
Highest month-end balance during year $ 334,500,000 $ 197,000,000 $ 69,000,000
Weighted average interest rate on balances outstanding at December 31 1.81% 2.59% 1.63%
Weighted average interest rate during year 2.31% 2.44% 1.18%
Federal Reserve discount window line of credit | Central Bank      
SHORT-TERM BORROWINGS      
Additional unused borrowings available $ 65,300,000 $ 73,900,000  
Commercial real estate and commercial loans pledged as collateral 126,100,000 123,300,000  
FHLB line of credit      
SHORT-TERM BORROWINGS      
Additional unused borrowings available 1,570,000,000    
Letters of Credit Outstanding, Amount 78,900,000 $ 4,600,000  
Commercial real estate and commercial loans pledged as collateral $ 2,480,000,000