SECURITIES - Schedule of Securities By Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 4,331
Due after one year through five years	8,799
Due after five years through ten years	30,996
Due after ten years	674,319
Total available-for-sale securities, gross	718,445
Mortgage-backed securities	545,616
Amortized Cost	1,264,061	$ 1,400,783
Fair Value
Due in one year or less	4,312
Due after one year through five years	8,052
Due after five years through ten years	29,763
Due after ten years	557,909
Total available-for-sale securities, gross	600,036
Mortgage-backed securities	462,033
Total securities available-for-sale	1,062,069	1,185,528
Amortized Cost
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	129,070
Total held-to-maturity securities, gross	129,070
Mortgage-backed securities	0
Amortized Cost	129,070
Fair Value
Due in one year or less	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	114,264
Total held-to-maturity securities, gross	114,264
Mortgage-backed securities	0
Fair Value	$ 114,264	$ 111,029