SECURITIES - Securities Held-to-maturity Major Categories (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 383,922	$ 179,309
Gross Unrecognized Gains		59
Gross Unrecognized Losses	(25,233)	(2,014)
Fair Value	358,689	177,354
Agency Notes
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	88,858
Gross Unrecognized Losses	(5,025)
Fair Value	83,833
Pass-through mortgage-backed securities ("MBS") issued by government sponsored entities ("GSEs")
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	180,379	118,382
Gross Unrecognized Gains		59
Gross Unrecognized Losses	(13,503)	(1,141)
Fair Value	166,876	117,300
Agency collateralized mortgage obligations ("CMOs")
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	114,685	60,927
Gross Unrecognized Losses	(6,705)	(873)
Fair Value	$ 107,980	$ 60,054