SECURITIES - Held-to-maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Securities held-to-maturity:
Amortized Cost	$ 603,960	$ 585,798
Gross Unrecognized Losses	(83,891)	(80,039)
Fair Value	520,069	505,759
Agency Notes
Securities held-to-maturity:
Amortized Cost	89,359	89,157
Gross Unrecognized Losses	(13,284)	(14,095)
Fair Value	76,075	75,062
Corporate Securities
Securities held-to-maturity:
Amortized Cost	9,000	9,000
Gross Unrecognized Losses	(1,340)	(553)
Fair Value	7,660	8,447
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs")
Securities held-to-maturity:
Amortized Cost	286,918	278,281
Gross Unrecognized Losses	(40,848)	(40,960)
Fair Value	246,070	237,321
Agency collateralized mortgage obligations ("CMOs")
Securities held-to-maturity:
Amortized Cost	218,683	209,360
Gross Unrecognized Losses	(28,419)	(24,431)
Fair Value	$ 190,264	$ 184,929