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Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Available-for-sale [Abstract]
Amortized Cost		$ 1,433,097	$ 1,332,467
Gross unrealized gains		10,470	3,658
Gross unrealized losses		35,130	39,831
Securities AFS, at estimated fair value		1,408,437	1,296,294
HELD TO MATURITY
Amortized cost		1,288,403	1,307,053
Gross unrealized gains		8,986	10,571
Gross unrealized losses		127,866	151,462
Estimated Fair Value		1,169,523	1,166,162
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost		174,076	139,706
Gross unrealized gains		91	19
Gross unrealized losses		0	0
Securities AFS, at estimated fair value		174,167	139,725
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		468,836	603,913
Gross unrealized gains		135	362
Gross unrealized losses		32,044	35,530
Securities AFS, at estimated fair value		436,927	568,745
HELD TO MATURITY
Amortized cost		1,040,876	1,039,440
Gross unrealized gains		8,810	10,070
Gross unrealized losses		110,543	126,233
Estimated Fair Value		939,143	923,277
Corporate bonds and other
Available-for-sale [Abstract]
Amortized Cost		14,626	14,569
Gross unrealized gains		147	31
Gross unrealized losses		414	507
Securities AFS, at estimated fair value		14,359	14,093
HELD TO MATURITY
Amortized cost		131,456	146,712
Gross unrealized gains		157	488
Gross unrealized losses		10,387	15,738
Estimated Fair Value		121,226	131,462
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	770,310	569,039
Gross unrealized gains	[1]	10,016	3,202
Gross unrealized losses	[1]	2,233	3,258
Securities AFS, at estimated fair value	[1]	778,093	568,983
HELD TO MATURITY
Amortized cost	[1]	86,321	90,619
Gross unrealized gains	[1]	19	13
Gross unrealized losses	[1]	5,493	7,263
Estimated Fair Value	[1]	80,847	83,369
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	5,249	5,240
Gross unrealized gains	[1]	81	44
Gross unrealized losses	[1]	439	536
Securities AFS, at estimated fair value	[1]	4,891	4,748
HELD TO MATURITY
Amortized cost	[1]	29,750	30,282
Gross unrealized gains	[1]	0	0
Gross unrealized losses	[1]	1,443	2,228
Estimated Fair Value	[1]	$ 28,307	$ 28,054
[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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