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Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		$ 22,199,058	$ 21,002,310
Nonaccrual loans		83,969	68,688
Total loans		22,380,852	21,180,538
Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		97,805	107,345
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		20	2,195
Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		97,825	109,540
Warehouse Purchase Program Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,228,706	822,245
Total loans		1,228,706	822,245
Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		1,015,336	806,011
Nonaccrual loans		2,686	1,460
Total loans		1,033,224	816,043
Agriculture [Member] | Financing Receivables, 30 to 89 Days Past Due [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		15,202	8,572
Agriculture [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		15,202	8,572
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		2,801,720	3,038,559
Nonaccrual loans		1,848	14,770
Total loans		2,814,521	3,076,591
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		10,953	21,627
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	1,635
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		10,953	23,262
Real Estate [Member] | Agriculture [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans		1,033,224
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]	8,398,891	8,103,904
Nonaccrual loans	[1]	34,611	25,694
Total loans	[1]	8,477,534	8,168,078
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]	44,032	38,350
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]		130
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]	44,032	38,480
Real Estate [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		5,830,324	5,620,775
Nonaccrual loans		31,685	18,662
Total loans		5,869,687	5,662,948
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		7,678	23,511
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		7,678	23,511
Commercial and Industrial [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		2,514,022	2,281,762
Nonaccrual loans		13,080	8,066
Total loans		2,543,632	2,305,040
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		16,530	14,782
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	430
Commercial and Industrial [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		16,530	15,212
Consumer and Other [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		410,059	329,054
Nonaccrual loans		59	36
Total loans		413,548	329,593
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		3,410	503
Consumer and Other [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		20
Consumer and Other [Member] | Financing Receivables Past Due Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans past due and still accruing		$ 3,430	$ 503
[1] Includes $6.1 million and $5.7 million of residential mortgage loans held for sale at September 30, 2024 and December 31, 2023, respectively.

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