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BORROWING ARRANGEMENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Federal funds purchased and repurchase agreements $ 36,810 $ 9,498
FHLB borrowings 719,065 1,017,361
Federal funds purchased and repurchase agreements:    
Debt Instrument [Line Items]    
Federal funds purchased and repurchase agreements 36,810 9,498
Average amount outstanding during the period [1] 10,880 8,120
Maximum amount outstanding during the period [2] $ 36,810 $ 9,498
Weighted average interest rate during the period [3] 1.40% 0.20%
Interest rate at end of period [4] 2.10% 0.20%
FHLB borrowings:    
Debt Instrument [Line Items]    
FHLB borrowings $ 719,065 $ 1,017,361
Average amount outstanding during the period [1] 720,785 1,222,033
Maximum amount outstanding during the period [2] $ 957,231 $ 1,414,453
Weighted average interest rate during the period [3] 1.80% 1.20%
Interest rate at end of period [4] 2.30% 1.40%
[1] The average amount outstanding during the period was computed by dividing the total daily outstanding principal balances by the number of days in the period.
[2] The maximum amount outstanding at any month-end during the period.
[3] The weighted average interest rate during the period was computed by dividing the actual interest expense by the average amount outstanding during the period. The weighted average interest rate on the FHLB borrowings includes the effect of interest rate swaps.
[4] Stated rate.