SECURITIES - Schedule of Securities By Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 3,403
Due after one year through five years	8,802
Due after five years through ten years	57,634
Due after ten years	786,695
Total available-for-sale securities, gross	856,534
Mortgage-backed securities	619,651
Amortized Cost	1,476,185	$ 1,376,969
Fair Value
Due in one year or less	3,394
Due after one year through five years	8,866
Due after five years through ten years	56,380
Due after ten years	673,818
Total available-for-sale securities, gross	742,458
Mortgage-backed securities	558,122
Total securities available-for-sale	1,300,580	1,398,558
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	127,411
Total held-to-maturity securities, gross	127,411
Mortgage-backed securities	0
Amortized Cost	127,411
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	113,350
Total held-to-maturity securities, gross	113,350
Mortgage-backed securities	0
Fair Value	$ 113,350	$ 0