SECURITIES - Amortized Cost and Fair Value By Contractual Maturity, Held-to-maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Held-to-maturity, Amortized Cost
One to five years	$ 19,783
Five to ten years	78,780
Pass-through MBS issued by GSEs and agency CMO	496,076
Total Amortized Cost	594,639
Held-to-maturity, Fair Value
One to five years	18,397
Five to ten years	67,041
Pass-through MBS issued by GSEs and agency CMO	431,492
Total Fair Value	$ 516,930	$ 505,759