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Loans and Allowance for Credit Losses - Schedule of Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Past Due [Line Items]    
Loans $ 17,188,817 $ 17,005,937
90 Days Past Due & Accruing 423 603
Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 39,762 48,196
90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 116,371 81,698
Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 156,133 129,894
Current    
Financing Receivable, Past Due [Line Items]    
Loans 17,032,684 16,876,043
Consumer:    
Financing Receivable, Past Due [Line Items]    
Loans 285,355 308,994
90 Days Past Due & Accruing 423 529
Consumer: | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,502 3,576
Consumer: | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 748 1,016
Consumer: | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 3,250 4,592
Consumer: | Current    
Financing Receivable, Past Due [Line Items]    
Loans 282,105 304,402
Consumer: | Credit cards    
Financing Receivable, Past Due [Line Items]    
Loans 173,020 181,675
90 Days Past Due & Accruing 423 529
Consumer: | Credit cards | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,360 1,824
Consumer: | Credit cards | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 613 635
Consumer: | Credit cards | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,973 2,459
Consumer: | Credit cards | Current    
Financing Receivable, Past Due [Line Items]    
Loans 171,047 179,216
Consumer: | Other consumer    
Financing Receivable, Past Due [Line Items]    
Loans 112,335 127,319
90 Days Past Due & Accruing 0 0
Consumer: | Other consumer | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,142 1,752
Consumer: | Other consumer | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 135 381
Consumer: | Other consumer | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,277 2,133
Consumer: | Other consumer | Current    
Financing Receivable, Past Due [Line Items]    
Loans 111,058 125,186
Real Estate    
Financing Receivable, Past Due [Line Items]    
Loans 13,368,321 13,391,531
90 Days Past Due & Accruing 0 0
Real Estate | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 31,669 40,416
Real Estate | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 89,477 53,516
Real Estate | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 121,146 93,932
Real Estate | Current    
Financing Receivable, Past Due [Line Items]    
Loans 13,247,175 13,297,599
Real Estate | Construction and development    
Financing Receivable, Past Due [Line Items]    
Loans 2,874,823 2,789,249
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 283 332
Real Estate | Construction and development | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 9,285 10,530
Real Estate | Construction and development | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 9,568 10,862
Real Estate | Construction and development | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,865,255 2,778,387
Real Estate | Single family residential    
Financing Receivable, Past Due [Line Items]    
Loans 2,617,849 2,689,946
90 Days Past Due & Accruing 0 0
Real Estate | Single family residential | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 18,401 34,651
Real Estate | Single family residential | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 12,250 16,013
Real Estate | Single family residential | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 30,651 50,664
Real Estate | Single family residential | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,587,198 2,639,282
Real Estate | Other commercial    
Financing Receivable, Past Due [Line Items]    
Loans 7,875,649 7,912,336
90 Days Past Due & Accruing 0 0
Real Estate | Other commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 12,985 5,433
Real Estate | Other commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 67,942 26,973
Real Estate | Other commercial | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 80,927 32,406
Real Estate | Other commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 7,794,722 7,879,930
Commercial    
Financing Receivable, Past Due [Line Items]    
Loans 2,750,569 2,695,329
90 Days Past Due & Accruing 0 74
Commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 5,591 3,928
Commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 26,143 27,163
Commercial | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 31,734 31,091
Commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,718,835 2,664,238
Commercial | Commercial    
Financing Receivable, Past Due [Line Items]    
Loans 2,397,388 2,434,175
90 Days Past Due & Accruing 0 74
Commercial | Commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 4,953 3,535
Commercial | Commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 25,251 27,059
Commercial | Commercial | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 30,204 30,594
Commercial | Commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,367,184 2,403,581
Commercial | Agricultural    
Financing Receivable, Past Due [Line Items]    
Loans 353,181 261,154
90 Days Past Due & Accruing 0 0
Commercial | Agricultural | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 638 393
Commercial | Agricultural | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 892 104
Commercial | Agricultural | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,530 497
Commercial | Agricultural | Current    
Financing Receivable, Past Due [Line Items]    
Loans 351,651 260,657
Other    
Financing Receivable, Past Due [Line Items]    
Loans 784,572 610,083
90 Days Past Due & Accruing 0 0
Other | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 0 276
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 3 279
Other | Current    
Financing Receivable, Past Due [Line Items]    
Loans $ 784,569 $ 609,804