BORROWINGS (Short-Term Borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Borrowings [Abstract]
Securities sold under agreements to repurchase	$ 105,522	$ 100,888
Federal Funds Purchased	168,000	150,000
FHLB Advances	0	100,000
Total short-term borrowings	273,522	350,888
Average outstanding balance during the period	$ 149,761	$ 213,932
Average interest rate (during the period)	0.13%	0.79%
Average interest rate at end of period	0.08%	0.13%