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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 17,336,040 | $ 16,845,670
90 Days Past Due & Accruing | 830 | 1,147
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 47,473 | 55,666
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 65,026 | 42,701
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 112,499 | 98,367
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 17,223,541 | 16,747,303
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 291,592 | 318,666
90 Days Past Due & Accruing | 561 | 791
Consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,637 | 3,205
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 910 | 1,108
Consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,547 | 4,313
Consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 288,045 | 314,353
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 177,696 | 191,204
90 Days Past Due & Accruing | 561 | 791
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,535 | 1,734
Consumer | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 706 | 892
Consumer | Credit cards | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,241 | 2,626
Consumer | Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 175,455 | 188,578
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 113,896 | 127,462
90 Days Past Due & Accruing | 0 | 0
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,102 | 1,471
Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 204 | 216
Consumer | Other consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,306 | 1,687
Consumer | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 112,590 | 125,775
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,513,463 | 13,338,186
90 Days Past Due & Accruing | 155 | 7
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 32,146 | 38,570
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 39,013 | 18,324
Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 71,159 | 56,894
Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,442,304 | 13,281,292
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,796,378 | 3,144,220
90 Days Past Due & Accruing | 0 | 0
Real Estate | Construction and development | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,338 | 3,171
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,438 | 2,190
Real Estate | Construction and development | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,776 | 5,361
Real Estate | Construction and development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,790,602 | 3,138,859
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,724,648 | 2,641,556
90 Days Past Due & Accruing | 69 | 7
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 15,647 | 30,697
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 15,616 | 12,522
Real Estate | Single family residential | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 31,263 | 43,219
Real Estate | Single family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,693,385 | 2,598,337
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,992,437 | 7,552,410
90 Days Past Due & Accruing | 86 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,161 | 4,702
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 21,959 | 3,612
Real Estate | Other commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 34,120 | 8,314
Real Estate | Other commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,958,317 | 7,544,096
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,781,724 | 2,722,886
90 Days Past Due & Accruing | 114 | 349
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,413 | 13,891
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 25,100 | 23,266
Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 37,513 | 37,157
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,744,211 | 2,685,729
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,467,384 | 2,490,176
90 Days Past Due & Accruing | 114 | 349
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,407 | 13,799
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 24,566 | 22,750
Commercial | Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 36,973 | 36,549
Commercial | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,430,411 | 2,453,627
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 314,340 | 232,710
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 6 | 92
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 534 | 516
Commercial | Agricultural | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 540 | 608
Commercial | Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 313,800 | 232,102
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 749,261 | 465,932
90 Days Past Due & Accruing | 0 | 0
Other | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 277 | 0
Other | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3 | 3
Other | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 280 | 3
Other | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 748,981 | $ 465,929

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