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SHORT-TERM BORROWINGS (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SHORT-TERM BORROWINGS      
Maximum borrowing capacity $ 1,830,000,000    
Amount outstanding at December 31 0 $ 22,000,000 $ 150,000,000
Interest expense on short-term borrowings 2,000 718,000 4,285,000
Average amount outstanding during year 607,000 89,904,000 185,909,000
Highest month-end balance during year $ 6,500,000 $ 222,000,000 $ 334,500,000
Weighted-average interest rate on balances outstanding at December 31 0.00% 0.29% 1.81%
Weighted-average interest rate during year 0.30% 0.80% 2.31%
Federal Home Loan Bank Borrowings [Member]      
SHORT-TERM BORROWINGS      
Standby letters of credit issued $ 32,200,000 $ 268,000,000  
Federal Reserve discount window line of credit | Central Bank      
SHORT-TERM BORROWINGS      
Additional unused borrowings available 55,400,000 64,500,000  
Commercial real estate and commercial loans pledged as collateral 131,000,000 $ 136,900,000  
FHLB line of credit      
SHORT-TERM BORROWINGS      
Additional unused borrowings available 1,800,000,000    
Commercial real estate and commercial loans pledged as collateral $ 2,680,000,000