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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, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 16,555,098 | $ 16,142,124
90 Days Past Due & Accruing | 437 | 507
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 36,309 | 38,416
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 29,474 | 26,886
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 65,783 | 65,302
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 16,489,315 | 16,076,822
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 331,407 | 349,810
90 Days Past Due & Accruing | 301 | 225
Consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,665 | 2,149
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 693 | 623
Consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,358 | 2,772
Consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 328,049 | 347,038
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 188,590 | 196,928
90 Days Past Due & Accruing | 301 | 225
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,695 | 1,297
Consumer | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 385 | 409
Consumer | Credit cards | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,080 | 1,706
Consumer | Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 186,510 | 195,222
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 142,817 | 152,882
90 Days Past Due & Accruing | 0 | 0
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 970 | 852
Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 308 | 214
Consumer | Other consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,278 | 1,066
Consumer | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 141,539 | 151,816
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,887,917 | 12,581,262
90 Days Past Due & Accruing | 0 | 106
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 23,246 | 31,061
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 17,508 | 18,618
Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 40,754 | 49,679
Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,847,163 | 12,531,583
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,777,122 | 2,566,649
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 | 383 | 4,677
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,384 | 443
Real Estate | Construction and development | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,767 | 5,120
Real Estate | Construction and development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,772,355 | 2,561,529
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,589,831 | 2,546,115
90 Days Past Due & Accruing | 0 | 106
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 19,220 | 23,625
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,415 | 11,075
Real Estate | Single family residential | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 28,635 | 34,700
Real Estate | Single family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,561,196 | 2,511,415
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,520,964 | 7,468,498
90 Days Past Due & Accruing | 0 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,643 | 2,759
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,709 | 7,100
Real Estate | Other commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,352 | 9,859
Real Estate | Other commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,513,612 | 7,458,639
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,890,372 | 2,837,913
90 Days Past Due & Accruing | 136 | 176
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 10,398 | 5,145
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,270 | 7,642
Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 21,668 | 12,787
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,868,704 | 2,825,126
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,669,731 | 2,632,290
90 Days Past Due & Accruing | 136 | 176
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 10,170 | 5,034
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,248 | 7,575
Commercial | Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 21,418 | 12,609
Commercial | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,648,313 | 2,619,681
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 220,641 | 205,623
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 228 | 111
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 22 | 67
Commercial | Agricultural | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 250 | 178
Commercial | Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 220,391 | 205,445
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 445,402 | 373,139
90 Days Past Due & Accruing | 0 | 0
Other | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 61
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 | 64
Other | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 445,399 | $ 373,075

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