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Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Available-for-sale [Abstract]
Amortized Cost		$ 1,472,520	$ 1,387,874
Gross unrealized gains		373	1,282
Gross unrealized losses		137,333	90,142
Securities AFS, at estimated fair value		1,335,560	1,299,014
HELD TO MATURITY
Amortized cost		1,307,886	1,326,729
Gross unrealized gains		314	4,565
Gross unrealized losses		255,770	182,138
Estimated Fair Value		1,052,430	1,149,156
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost		224,174
Gross unrealized gains		35
Gross unrealized losses		0
Securities AFS, at estimated fair value		224,209
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		822,753	1,039,453
Gross unrealized gains		14	956
Gross unrealized losses		114,224	75,557
Securities AFS, at estimated fair value		708,543	964,852
HELD TO MATURITY
Amortized cost		1,038,934	1,037,556
Gross unrealized gains		0	3,969
Gross unrealized losses		225,921	163,283
Estimated Fair Value		813,013	878,242
Corporate bonds and other
Available-for-sale [Abstract]
Amortized Cost		14,550	8,692
Gross unrealized gains		19	26
Gross unrealized losses		1,173	14
Securities AFS, at estimated fair value		13,396	8,704
HELD TO MATURITY
Amortized cost		146,540	152,552
Gross unrealized gains		313	575
Gross unrealized losses		15,280	7,993
Estimated Fair Value		131,573	145,134
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	399,943	328,400
Gross unrealized gains	[1]	305	250
Gross unrealized losses	[1]	20,861	13,623
Securities AFS, at estimated fair value	[1]	379,387	315,027
HELD TO MATURITY
Amortized cost	[1]	91,954	93,796
Gross unrealized gains	[1]	1	21
Gross unrealized losses	[1]	11,305	8,343
Estimated Fair Value	[1]	80,650	85,474
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	11,100	11,329
Gross unrealized gains	[1]	0	50
Gross unrealized losses	[1]	1,075	948
Securities AFS, at estimated fair value	[1]	10,025	10,431
HELD TO MATURITY
Amortized cost	[1]	30,458	42,825
Gross unrealized gains	[1]	0	0
Gross unrealized losses	[1]	3,264	2,519
Estimated Fair Value	[1]	$ 27,194	$ 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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