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Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022
Available-for-sale [Abstract]
Amortized Cost		$ 1,499,135	$ 1,387,874
Gross unrealized gains		2,511	1,282
Gross unrealized losses		64,424	90,142
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		1,437,222	1,299,014
HELD TO MATURITY
Amortized cost		1,308,457	1,326,729
Gross unrealized gains		9,288	4,565
Gross unrealized losses		145,171	182,138
Estimated Fair Value		1,172,574	1,149,156
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost		297,061
Gross unrealized gains		96
Gross unrealized losses		0
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		297,157
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		938,822	1,039,453
Gross unrealized gains		2,023	956
Gross unrealized losses		54,373	75,557
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		886,472	964,852
HELD TO MATURITY
Amortized cost		1,038,054	1,037,556
Gross unrealized gains		8,703	3,969
Gross unrealized losses		126,946	163,283
Estimated Fair Value		919,811	878,242
Corporate bonds and other
Available-for-sale [Abstract]
Amortized Cost		14,513	8,692
Gross unrealized gains		33	26
Gross unrealized losses		1,135	14
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)		13,411	8,704
HELD TO MATURITY
Amortized cost		146,203	152,552
Gross unrealized gains		561	575
Gross unrealized losses		9,821	7,993
Estimated Fair Value		136,943	145,134
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	237,426	328,400
Gross unrealized gains	[1]	302	250
Gross unrealized losses	[1]	7,992	13,623
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[1]	229,736	315,027
HELD TO MATURITY
Amortized cost	[1]	93,399	93,796
Gross unrealized gains	[1]	24	21
Gross unrealized losses	[1]	6,282	8,343
Estimated Fair Value	[1]	87,141	85,474
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	11,313	11,329
Gross unrealized gains	[1]	57	50
Gross unrealized losses	[1]	924	948
Securities AFS, at estimated fair value (amortized cost of $1,499,135 and $1,387,874, respectively)	[1]	10,446	10,431
HELD TO MATURITY
Amortized cost	[1]	30,801	42,825
Gross unrealized gains	[1]	0	0
Gross unrealized losses	[1]	2,122	2,519
Estimated Fair Value	[1]	$ 28,679	$ 40,306
[1] All MBS are issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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