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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
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Past Due [Line Items]    
Loans $ 17,192,437 $ 16,845,670
90 Days Past Due & Accruing 558 1,147
Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 39,512 55,666
90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 61,908 42,701
Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 101,420 98,367
Current    
Financing Receivable, Past Due [Line Items]    
Loans 17,091,017 16,747,303
Consumer    
Financing Receivable, Past Due [Line Items]    
Loans 308,632 318,666
90 Days Past Due & Accruing 544 791
Consumer | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,928 3,205
Consumer | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 778 1,108
Consumer | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 3,706 4,313
Consumer | Current    
Financing Receivable, Past Due [Line Items]    
Loans 304,926 314,353
Consumer | Credit cards    
Financing Receivable, Past Due [Line Items]    
Loans 178,354 191,204
90 Days Past Due & Accruing 544 791
Consumer | Credit cards | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,941 1,734
Consumer | Credit cards | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 670 892
Consumer | Credit cards | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,611 2,626
Consumer | Credit cards | Current    
Financing Receivable, Past Due [Line Items]    
Loans 175,743 188,578
Consumer | Other consumer    
Financing Receivable, Past Due [Line Items]    
Loans 130,278 127,462
90 Days Past Due & Accruing 0 0
Consumer | Other consumer | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 987 1,471
Consumer | Other consumer | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 108 216
Consumer | Other consumer | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,095 1,687
Consumer | Other consumer | Current    
Financing Receivable, Past Due [Line Items]    
Loans 129,183 125,775
Real Estate    
Financing Receivable, Past Due [Line Items]    
Loans 13,483,170 13,338,186
90 Days Past Due & Accruing 14 7
Real Estate | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 28,631 38,570
Real Estate | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 34,225 18,324
Real Estate | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 62,856 56,894
Real Estate | Current    
Financing Receivable, Past Due [Line Items]    
Loans 13,420,314 13,281,292
Real Estate | Construction and development    
Financing Receivable, Past Due [Line Items]    
Loans 3,056,703 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 788 3,171
Real Estate | Construction and development | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,465 2,190
Real Estate | Construction and development | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,253 5,361
Real Estate | Construction and development | Current    
Financing Receivable, Past Due [Line Items]    
Loans 3,054,450 3,138,859
Real Estate | Single family residential    
Financing Receivable, Past Due [Line Items]    
Loans 2,666,201 2,641,556
90 Days Past Due & Accruing 14 7
Real Estate | Single family residential | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 19,991 30,697
Real Estate | Single family residential | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 13,744 12,522
Real Estate | Single family residential | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 33,735 43,219
Real Estate | Single family residential | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,632,466 2,598,337
Real Estate | Other commercial    
Financing Receivable, Past Due [Line Items]    
Loans 7,760,266 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 7,852 4,702
Real Estate | Other commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 19,016 3,612
Real Estate | Other commercial | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 26,868 8,314
Real Estate | Other commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 7,733,398 7,544,096
Commercial    
Financing Receivable, Past Due [Line Items]    
Loans 2,769,655 2,722,886
90 Days Past Due & Accruing 0 349
Commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 7,953 13,891
Commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 26,902 23,266
Commercial | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 34,855 37,157
Commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,734,800 2,685,729
Commercial | Commercial    
Financing Receivable, Past Due [Line Items]    
Loans 2,484,474 2,490,176
90 Days Past Due & Accruing 0 349
Commercial | Commercial | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 6,637 13,799
Commercial | Commercial | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 26,858 22,750
Commercial | Commercial | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 33,495 36,549
Commercial | Commercial | Current    
Financing Receivable, Past Due [Line Items]    
Loans 2,450,979 2,453,627
Commercial | Agricultural    
Financing Receivable, Past Due [Line Items]    
Loans 285,181 232,710
90 Days Past Due & Accruing 0 0
Commercial | Agricultural | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,316 92
Commercial | Agricultural | 90 Days or More Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 44 516
Commercial | Agricultural | Total Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,360 608
Commercial | Agricultural | Current    
Financing Receivable, Past Due [Line Items]    
Loans 283,821 232,102
Other    
Financing Receivable, Past Due [Line Items]    
Loans 630,980 465,932
90 Days Past Due & Accruing 0 0
Other | Gross 30-89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 0 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 3 3
Other | Current    
Financing Receivable, Past Due [Line Items]    
Loans $ 630,977 $ 465,929