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Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		$ 21,850,297	$ 21,954,942
Nonaccrual loans		105,529	73,647
Total loans		22,027,769	22,149,209
Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		71,675	118,431
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		268	2,189
Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		71,943	120,620
Warehouse Purchase Program Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,278,178	1,080,903
Total loans		1,278,178	1,080,903
Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,000,906	1,025,783
Nonaccrual loans		17,079	2,634
Total loans		1,019,589	1,033,546
Agriculture [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,604	4,554
Agriculture [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		0	575
Agriculture [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,604	5,129
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		2,853,471	2,835,471
Nonaccrual loans		151	2,079
Total loans		2,865,280	2,859,281
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		11,658	21,464
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		0	267
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		11,658	21,731
Real Estate [Member] | Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans		1,019,589
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	8,214,822	8,396,150
Nonaccrual loans	[1]	49,832	42,048
Total loans	[1]	8,310,639	8,487,589
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	45,737	49,391
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	248
Real Estate [Member] | 1-4 Family Residential (Includes Home Equity) [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing	[1]	45,985	49,391
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		5,785,729	5,766,838
Nonaccrual loans		5,314	18,455
Total loans		5,796,937	5,800,985
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		5,894	15,692
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		5,894	15,692
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		2,352,414	2,471,541
Nonaccrual loans		32,133	8,348
Total loans		2,391,119	2,508,088
Commercial and Industrial [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		6,572	26,852
Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		0	1,347
Commercial and Industrial [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		6,572	28,199
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		364,777	378,256
Nonaccrual loans		1,020	83
Total loans		366,027	378,817
Consumer and Other [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		210	478
Consumer and Other [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		$ 230	$ 478
[1] Includes $11.3 million and $10.7 million of residential mortgage loans held for sale at September 30, 2025, and December 31, 2024, respectively.

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