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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 17,001,760 | $ 16,845,670
90 Days Past Due & Accruing | 1,527 | 1,147
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 48,720 | 55,666
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 46,475 | 42,701
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 95,195 | 98,367
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 16,906,565 | 16,747,303
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 307,273 | 318,666
90 Days Past Due & Accruing | 562 | 791
Consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,680 | 3,205
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 838 | 1,108
Consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,518 | 4,313
Consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 303,755 | 314,353
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 182,742 | 191,204
90 Days Past Due & Accruing | 558 | 791
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,697 | 1,734
Consumer | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 666 | 892
Consumer | Credit cards | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,363 | 2,626
Consumer | Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 180,379 | 188,578
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 124,531 | 127,462
90 Days Past Due & Accruing | 4 | 0
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 983 | 1,471
Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 172 | 216
Consumer | Other consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,155 | 1,687
Consumer | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 123,376 | 125,775
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,464,526 | 13,338,186
90 Days Past Due & Accruing | 716 | 7
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 33,276 | 38,570
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 19,426 | 18,324
Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 52,702 | 56,894
Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,411,824 | 13,281,292
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,331,739 | 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 | 5,409 | 3,171
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,584 | 2,190
Real Estate | Construction and development | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 6,993 | 5,361
Real Estate | Construction and development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,324,746 | 3,138,859
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,624,738 | 2,641,556
90 Days Past Due & Accruing | 716 | 7
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 24,818 | 30,697
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,440 | 12,522
Real Estate | Single family residential | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 38,258 | 43,219
Real Estate | Single family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,586,480 | 2,598,337
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,508,049 | 7,552,410
90 Days Past Due & Accruing | 0 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,049 | 4,702
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,402 | 3,612
Real Estate | Other commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,451 | 8,314
Real Estate | Other commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,500,598 | 7,544,096
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,725,953 | 2,722,886
90 Days Past Due & Accruing | 249 | 349
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,483 | 13,891
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 26,208 | 23,266
Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 38,691 | 37,157
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,687,262 | 2,685,729
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,499,311 | 2,490,176
90 Days Past Due & Accruing | 249 | 349
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,418 | 13,799
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 25,611 | 22,750
Commercial | Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 38,029 | 36,549
Commercial | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,461,282 | 2,453,627
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 226,642 | 232,710
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 65 | 92
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 597 | 516
Commercial | Agricultural | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 662 | 608
Commercial | Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 225,980 | 232,102
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 504,008 | 465,932
90 Days Past Due & Accruing | 0 | 0
Other | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 281 | 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 | 284 | 3
Other | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 503,724 | $ 465,929

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