SECURITIES (Held to maturity securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 85,341	$ 88,890
Gross Unrealized Gains	9,741	11,151
Gross Unrealized Losses	0	0
Estimated Fair Value	95,082	100,041
Allowance for Credit Losses	(48)	(51)
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	85,341	88,890
Gross Unrealized Gains	9,741	11,151
Gross Unrealized Losses	0	0
Estimated Fair Value	95,082	100,041
Allowance for Credit Losses	$ (48)	$ (51)	$ (197)	$ 0