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Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Available-for-sale [Abstract]
Amortized Cost		$ 2,117,597	$ 2,655,594
Gross unrealized gains		13,733	113,681
Gross unrealized losses		65,346	4,950
Securities available for sale, at estimated fair value		2,065,984	2,764,325
HELD TO MATURITY
Amortized cost		474,319	90,780
Gross unrealized gains		1,393	4,455
Gross unrealized losses		13,091	0
Estimated Fair Value		462,621	95,235
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost			58,084
Gross unrealized gains			843
Gross unrealized losses			50
Securities available for sale, at estimated fair value			58,877
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		1,614,421	1,962,257
Gross unrealized gains		10,637	93,893
Gross unrealized losses		58,873	4,214
Securities available for sale, at estimated fair value		1,566,185	2,051,936
HELD TO MATURITY
Amortized cost		386,573	788
Gross unrealized gains		944	3
Gross unrealized losses		12,767	0
Estimated Fair Value		374,750	791
Corporate bonds and other
Available-for-sale [Abstract]
Amortized Cost		144,264	133,333
Gross unrealized gains		253	2,408
Gross unrealized losses		3,191	209
Securities available for sale, at estimated fair value		141,326	135,532
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	280,804	411,727
Gross unrealized gains	[1]	2,581	14,895
Gross unrealized losses	[1]	2,694	272
Securities available for sale, at estimated fair value	[1]	280,691	426,350
HELD TO MATURITY
Amortized cost	[1]	37,986	38,644
Gross unrealized gains	[1]	387	2,103
Gross unrealized losses	[1]	64	0
Estimated Fair Value	[1]	38,309	40,747
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	78,108	90,193
Gross unrealized gains	[1]	262	1,642
Gross unrealized losses	[1]	588	205
Securities available for sale, at estimated fair value	[1]	77,782	91,630
HELD TO MATURITY
Amortized cost	[1]	49,760	51,348
Gross unrealized gains	[1]	62	2,349
Gross unrealized losses	[1]	260	0
Estimated Fair Value	[1]	$ 49,562	$ 53,697
[1] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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