SECURITIES - Unrealized Loss Analysis on Available-for-Sale and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Less than 12 months, fair value	$ 888,199	$ 496,891
12 months or more, fair value	292,062	51,468
Total fair value	1,180,261	548,359
Less than 12 months, unrealized losses	179,054	6,714
12 Months or more, unrealized losses	77,173	1,941
Total unrealized losses	256,227	8,655
U.S. Treasury securities
Schedule of Available-for-sale Securities
Less than 12 months, fair value	1,968
12 months or more, fair value	0
Total fair value	1,968
Less than 12 months, unrealized losses	26
12 Months or more, unrealized losses	0
Total unrealized losses	26
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Less than 12 months, fair value	47,754	85,968
12 months or more, fair value	83,501	28,676
Total fair value	131,255	114,644
Less than 12 months, unrealized losses	9,295	1,364
12 Months or more, unrealized losses	18,619	1,081
Total unrealized losses	27,914	2,445
Mortgage-backed securities: residential
Schedule of Available-for-sale Securities
Less than 12 months, fair value	336,939	272,264
12 months or more, fair value	164,085	22,792
Total fair value	501,024	295,056
Less than 12 months, unrealized losses	52,248	4,076
12 Months or more, unrealized losses	40,334	860
Total unrealized losses	92,582	4,936
State and municipal securities
Schedule of Available-for-sale Securities
Less than 12 months, fair value	501,538	138,659
12 months or more, fair value	44,476	0
Total fair value	546,014	138,659
Less than 12 months, unrealized losses	117,485	1,274
12 Months or more, unrealized losses	18,220	0
Total unrealized losses	135,705	$ 1,274
Schedule of Held-to-Maturity Securities
Less than 12 months, fair value	103,326
12 months or more, fair value	0
Total fair value	103,326
Less than 12 months, unrealized losses	(24,494)
12 Months or more, unrealized losses	0
Total unrealized losses	$ (24,494)