SECURITIES - Schedule of Available For Sale Securities By Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 3,356
Due after one year through five years	11,031
Due after five years through ten years	54,556
Due after ten years	936,248
Total debt securities, gross	1,005,191
Mortgage-backed securities	634,750
Amortized Cost	1,639,941	$ 1,376,969
Fair Value
Due in one year or less	3,357
Due after one year through five years	11,140
Due after five years through ten years	54,559
Due after ten years	857,062
Total debt securities, gross	926,118
Mortgage-backed securities	596,417
Total debt securities	$ 1,522,535	$ 1,398,558