INVESTMENT SECURITIES - Schedule of Held-to-Maturity Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Estimated Fair Value
Less than 12 months, estimated fair value	$ 75,453	$ 73,202
12 months or more, estimated fair value	0	0
Total estimated fair value	75,453	73,202
Unrealized Losses
Less than 12 months, unrealized losses	(8,965)	(1,648)
12 months or more, unrealized losses	0	0
Total unrealized losses	(8,965)	(1,648)
State, county and municipal securities
Estimated Fair Value
Less than 12 months, estimated fair value	11,678	3,707
12 months or more, estimated fair value	0	0
Total estimated fair value	11,678	3,707
Unrealized Losses
Less than 12 months, unrealized losses	(2,227)	(198)
12 months or more, unrealized losses	0	0
Total unrealized losses	(2,227)	(198)
Mortgage-backed securities
Estimated Fair Value
Less than 12 months, estimated fair value	63,775	69,495
12 months or more, estimated fair value	0	0
Total estimated fair value	63,775	69,495
Unrealized Losses
Less than 12 months, unrealized losses	(6,738)	(1,450)
12 months or more, unrealized losses	0	0
Total unrealized losses	$ (6,738)	$ (1,450)