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Securities - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Available-for-sale [Abstract]
Amortized Cost		$ 1,454,043	$ 1,332,467
Gross unrealized gains		2,806	3,658
Gross unrealized losses		51,628	39,831
Securities AFS, at estimated fair value		1,405,221	1,296,294
HELD TO MATURITY
Amortized cost		1,306,898	1,307,053
Gross unrealized gains		7,104	10,571
Gross unrealized losses		161,816	151,462
Estimated Fair Value		1,152,186	1,166,162
US Treasury Securities
Available-for-sale [Abstract]
Amortized Cost		139,205	139,706
Gross unrealized gains		0	19
Gross unrealized losses		19	0
Securities AFS, at estimated fair value		139,186	139,725
State and political subdivisions
Available-for-sale [Abstract]
Amortized Cost		594,449	603,913
Gross unrealized gains		126	362
Gross unrealized losses		46,030	35,530
Securities AFS, at estimated fair value		548,545	568,745
HELD TO MATURITY
Amortized cost		1,039,958	1,039,440
Gross unrealized gains		6,658	10,070
Gross unrealized losses		138,034	126,233
Estimated Fair Value		908,582	923,277
Corporate bonds and other
Available-for-sale [Abstract]
Amortized Cost		14,587	14,569
Gross unrealized gains		37	31
Gross unrealized losses		915	507
Securities AFS, at estimated fair value		13,709	14,093
HELD TO MATURITY
Amortized cost		146,884	146,712
Gross unrealized gains		437	488
Gross unrealized losses		12,847	15,738
Estimated Fair Value		134,474	131,462
Residential
Available-for-sale [Abstract]
Amortized Cost	[1]	700,572	569,039
Gross unrealized gains	[1]	2,613	3,202
Gross unrealized losses	[1]	4,108	3,258
Securities AFS, at estimated fair value	[1]	699,077	568,983
HELD TO MATURITY
Amortized cost	[1]	89,952	90,619
Gross unrealized gains	[1]	9	13
Gross unrealized losses	[1]	8,578	7,263
Estimated Fair Value	[1]	81,383	83,369
Commercial
Available-for-sale [Abstract]
Amortized Cost	[1]	5,230	5,240
Gross unrealized gains	[1]	30	44
Gross unrealized losses	[1]	556	536
Securities AFS, at estimated fair value	[1]	4,704	4,748
HELD TO MATURITY
Amortized cost	[1]	30,104	30,282
Gross unrealized gains	[1]	0	0
Gross unrealized losses	[1]	2,357	2,228
Estimated Fair Value	[1]	$ 27,747	$ 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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