SECURITIES - Schedule of Securities By Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 2,233
Due after one year through five years	8,401
Due after five years through ten years	67,060
Due after ten years	773,371
Total available-for-sale securities, gross	851,065
Mortgage-backed securities	597,258
Amortized Cost	1,448,323	$ 1,376,969
Fair Value
Due in one year or less	2,213
Due after one year through five years	8,324
Due after five years through ten years	62,754
Due after ten years	614,139
Total available-for-sale securities, gross	687,430
Mortgage-backed securities	504,756
Total securities	1,192,186	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	127,820
Total held-to-maturity securities, gross	127,820
Mortgage-backed securities	0
Amortized Cost	127,820
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	103,326
Total held-to-maturity securities, gross	103,326
Mortgage-backed securities	0
Fair Value	$ 103,326	$ 0