SECURITIES - Held-to-maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities held-to-maturity:
Amortized Cost	$ 589,331	$ 594,639
Gross Unrecognized Gains		16
Gross Unrecognized Losses	(84,613)	(77,725)
Fair Value	504,718	516,930
Agency notes
Securities held-to-maturity:
Amortized Cost	89,666	89,563
Gross Unrecognized Losses	(11,891)	(11,300)
Fair Value	77,775	78,263
Corporate securities
Securities held-to-maturity:
Amortized Cost	9,000	9,000
Gross Unrecognized Losses	(1,530)	(1,825)
Fair Value	7,470	7,175
Pass-through MBS issued by GSEs
Securities held-to-maturity:
Amortized Cost	275,907	279,853
Gross Unrecognized Losses	(41,743)	(37,579)
Fair Value	234,164	242,274
Agency CMOs
Securities held-to-maturity:
Amortized Cost	214,758	216,223
Gross Unrecognized Gains		16
Gross Unrecognized Losses	(29,449)	(27,021)
Fair Value	$ 185,309	$ 189,218