SECURITIES (Held to maturity securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 85,354		$ 88,890
Gross Unrealized Gains	9,656		11,151
Gross Unrealized Losses	0		0
Estimated Fair Value	95,010		100,041
Allowance for Credit Losses	0		(51)
Obligations of states and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	85,354		88,890
Gross Unrealized Gains	9,656		11,151
Gross Unrealized Losses	0		0
Estimated Fair Value	95,010		100,041
Allowance for Credit Losses	$ 0	$ (51)	$ (51)	$ (61)	$ (62)	$ 0