SECURITIES - Held-to-maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Securities held-to-maturity:
Amortized Cost	$ 594,639	$ 585,798
Gross Unrecognized Gains	16
Gross Unrecognized Losses	(77,725)	(80,039)
Fair Value	516,930	505,759
US Government Agencies Debt Securities [Member]
Securities held-to-maturity:
Amortized Cost	89,563	89,157
Gross Unrecognized Losses	(11,300)	(14,095)
Fair Value	78,263	75,062
Corporate Debt Securities [Member]
Securities held-to-maturity:
Amortized Cost	9,000	9,000
Gross Unrecognized Losses	(1,825)	(553)
Fair Value	7,175	8,447
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs")
Securities held-to-maturity:
Amortized Cost	279,853	278,281
Gross Unrecognized Losses	(37,579)	(40,960)
Fair Value	242,274	237,321
Agency collateralized mortgage obligations ("CMOs")
Securities held-to-maturity:
Amortized Cost	216,223	209,360
Gross Unrecognized Gains	16
Gross Unrecognized Losses	(27,021)	(24,431)
Fair Value	$ 189,218	$ 184,929