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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