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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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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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