INVESTMENT SECURITIES - Held to maturity securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
HELD-TO-MATURITY SECURITIES:
Amortized Cost	$ 193,478	$ 195,088
Fair Value Adjustment	(112)	(65)
Amortized Carrying Value	193,366	195,023
Gross Unrealized Losses	25,610	23,830
Fair Value	167,756	171,193
Agency mortgage-backed securities
HELD-TO-MATURITY SECURITIES:
Amortized Cost	72,194	72,495
Fair Value Adjustment	2,293	2,436
Amortized Carrying Value	74,487	74,931
Gross Unrealized Losses	9,210	8,686
Fair Value	65,277	66,245
Agency collateralized mortgage obligations
HELD-TO-MATURITY SECURITIES:
Amortized Cost	115,110	116,405
Fair Value Adjustment	(2,410)	(2,502)
Amortized Carrying Value	112,700	113,903
Gross Unrealized Losses	15,819	14,662
Fair Value	96,881	99,241
States and political subdivisions
HELD-TO-MATURITY SECURITIES:
Amortized Cost	6,174	6,188
Fair Value Adjustment	5	1
Amortized Carrying Value	6,179	6,189
Gross Unrealized Losses	581	482
Fair Value	$ 5,598	$ 5,707