BORROWING ARRANGEMENTS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Balance at end of period		$ 28,358	$ 36,810
Balance at end of period		972,744	719,065
Other borrowings:
Debt Instrument [Line Items]
Balance at end of period		28,358	36,810
Average amount outstanding during the period	[1]	15,645	10,880
Maximum amount outstanding during the period	[2]	$ 28,358	$ 36,810
Weighted average interest rate during the period	[3]	1.70%	1.40%
Interest rate at end of period	[4]	1.70%	2.10%
Federal Home Loan Bank borrowings:
Debt Instrument [Line Items]
Balance at end of period		$ 972,744	$ 719,065
Average amount outstanding during the period	[1]	868,859	720,785
Maximum amount outstanding during the period	[2]	$ 1,077,883	$ 957,231
Weighted average interest rate during the period	[3]	2.00%	1.80%
Interest rate at end of period	[4]	1.80%	2.30%

[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.