INVESTMENT SECURITIES - Available for sale securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
AVAILABLE-FOR-SALE SECURITIES:
Amortized Cost	$ 532,220	$ 553,214
Gross Unrealized Gains	10	119
Gross Unrealized Losses	84,282	62,741
Fair Value	447,948	490,592
Agency mortgage-backed securities
AVAILABLE-FOR-SALE SECURITIES:
Amortized Cost	314,632	327,266
Gross Unrealized Losses	54,143	40,784
Fair Value	260,489	286,482
Agency collateralized mortgage obligations
AVAILABLE-FOR-SALE SECURITIES:
Amortized Cost	86,687	90,205
Gross Unrealized Losses	13,553	11,731
Fair Value	73,134	78,474
States and political subdivisions securities
AVAILABLE-FOR-SALE SECURITIES:
Amortized Cost	59,273	60,667
Gross Unrealized Gains	10	119
Gross Unrealized Losses	6,893	3,291
Fair Value	52,390	57,495
Small Business Administration securities
AVAILABLE-FOR-SALE SECURITIES:
Amortized Cost	71,628	75,076
Gross Unrealized Losses	9,693	6,935
Fair Value	$ 61,935	$ 68,141