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Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans past due and still accruing |  | $ 21,994,994 | $ 21,954,942
Nonaccrual loans |  | 102,031 | 73,647
Total loans |  | 22,197,388 | 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 |  | 99,787 | 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 |  | 576 | 2,189
Financing Receivables Past Due Loans [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans past due and still accruing |  | 100,363 | 120,620
Warehouse Purchase Program Loans [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans past due and still accruing |  | 1,287,440 | 1,080,903
Total loans |  | 1,287,440 | 1,080,903
Agriculture [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans past due and still accruing |  | 1,007,039 | 1,025,783
Nonaccrual loans |  | 17,465 | 2,634
Total loans |  | 1,029,249 | 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 |  | 4,663 | 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 |  | 82 | 575
Agriculture [Member] | Financing Receivables Past Due Loans [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans past due and still accruing |  | 4,745 | 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 |  | 2,859,877 | 2,835,471
Nonaccrual loans |  | 734 | 2,079
Total loans |  | 2,873,238 | 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 |  | 12,465 | 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 |  | 162 | 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 |  | 12,627 | 21,731
Real Estate [Member] | Agriculture [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans |  | 1,029,249 |
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] | 8,306,878 | 8,396,150
Nonaccrual loans | [1] | 44,861 | 42,048
Total loans | [1] | 8,400,187 | 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] | 48,448 | 49,391
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] | 48,448 | 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 |  | 5,804,556 | 5,766,838
Nonaccrual loans |  | 11,594 | 18,455
Total loans |  | 5,827,645 | 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 |  | 11,495 | 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 |  | 11,495 | 15,692
Commercial and Industrial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans past due and still accruing |  | 2,362,571 | 2,471,541
Nonaccrual loans |  | 27,348 | 8,348
Total loans |  | 2,410,882 | 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 |  | 20,631 | 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 |  | 332 | 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 |  | 20,963 | 28,199
Consumer and Other [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans past due and still accruing |  | 366,633 | 378,256
Nonaccrual loans |  | 29 | 83
Total loans |  | 368,747 | 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 |  | 2,085 | 478
Consumer and Other [Member] | Financing Receivables Past Due Loans [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans past due and still accruing |  | $ 2,085 | $ 478
[1] | Includes $6.0 million and $10.7 million of residential mortgage loans held for sale at June 30, 2025 and December 31, 2024, respectively.

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