INVESTMENT SECURITIES - Schedule of Held-to-Maturity Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Estimated Fair Value
Less than 12 months, estimated fair value	$ 97,144	$ 73,202
12 months or more, estimated fair value	0	0
Total estimated fair value	97,144	73,202
Unrealized Losses
Less than 12 months, unrealized losses	(14,510)	(1,648)
12 months or more, unrealized losses	0	0
Total unrealized losses	(14,510)	(1,648)
State, county and municipal securities
Estimated Fair Value
Less than 12 months, estimated fair value	27,626	3,707
12 months or more, estimated fair value	0	0
Total estimated fair value	27,626	3,707
Unrealized Losses
Less than 12 months, unrealized losses	(4,279)	(198)
12 months or more, unrealized losses	0	0
Total unrealized losses	(4,279)	(198)
Mortgage-backed securities
Estimated Fair Value
Less than 12 months, estimated fair value	69,518	69,495
12 months or more, estimated fair value	0	0
Total estimated fair value	69,518	69,495
Unrealized Losses
Less than 12 months, unrealized losses	(10,231)	(1,450)
12 months or more, unrealized losses	0	0
Total unrealized losses	$ (10,231)	$ (1,450)