INVESTMENT SECURITIES - Available for sale securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
AVAILABLE-FOR-SALE SECURITIES:
Amortized Cost	$ 526,235	$ 531,892
Gross Unrealized Gains	182	534
Gross Unrealized Losses	61,109	54,219
Fair Value	465,308	478,207
Agency mortgage-backed securities
AVAILABLE-FOR-SALE SECURITIES:
Amortized Cost	312,068	316,114
Gross Unrealized Gains		7
Gross Unrealized Losses	40,816	35,890
Fair Value	271,252	280,231
Agency collateralized mortgage obligations
AVAILABLE-FOR-SALE SECURITIES:
Amortized Cost	85,549	85,989
Gross Unrealized Losses	10,242	10,043
Fair Value	75,307	75,946
States and political subdivisions securities
AVAILABLE-FOR-SALE SECURITIES:
Amortized Cost	59,009	59,141
Gross Unrealized Gains	182	527
Gross Unrealized Losses	2,208	1,531
Fair Value	56,983	58,137
Small Business Administration securities
AVAILABLE-FOR-SALE SECURITIES:
Amortized Cost	69,609	70,648
Gross Unrealized Losses	7,843	6,755
Fair Value	$ 61,766	$ 63,893