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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 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 16,771,888 | $ 16,142,124
90 Days Past Due & Accruing | 806 | 507
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 28,385 | 38,416
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 38,900 | 26,886
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 67,285 | 65,302
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 16,704,603 | 16,076,822
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 304,382 | 349,810
90 Days Past Due & Accruing | 588 | 225
Consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,087 | 2,149
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 924 | 623
Consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,011 | 2,772
Consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 300,371 | 347,038
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 191,550 | 196,928
90 Days Past Due & Accruing | 588 | 225
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,973 | 1,297
Consumer | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 672 | 409
Consumer | Credit cards | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,645 | 1,706
Consumer | Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 188,905 | 195,222
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 112,832 | 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 | 1,114 | 852
Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 252 | 214
Consumer | Other consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,366 | 1,066
Consumer | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 111,466 | 151,816
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,245,208 | 12,581,262
90 Days Past Due & Accruing | 121 | 106
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 19,311 | 31,061
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 17,355 | 18,618
Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 36,666 | 49,679
Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,208,542 | 12,531,583
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,022,321 | 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 | 481 | 4,677
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,742 | 443
Real Estate | Construction and development | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,223 | 5,120
Real Estate | Construction and development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,019,098 | 2,561,529
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,657,879 | 2,546,115
90 Days Past Due & Accruing | 121 | 106
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,255 | 23,625
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,846 | 11,075
Real Estate | Single family residential | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 25,101 | 34,700
Real Estate | Single family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,632,778 | 2,511,415
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,565,008 | 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 | 5,575 | 2,759
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,767 | 7,100
Real Estate | Other commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,342 | 9,859
Real Estate | Other commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,556,666 | 7,458,639
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,773,989 | 2,837,913
90 Days Past Due & Accruing | 97 | 176
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,987 | 5,145
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 20,618 | 7,642
Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 26,605 | 12,787
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,747,384 | 2,825,126
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,477,077 | 2,632,290
90 Days Past Due & Accruing | 97 | 176
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,911 | 5,034
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 20,492 | 7,575
Commercial | Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 26,403 | 12,609
Commercial | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,450,674 | 2,619,681
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 296,912 | 205,623
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 76 | 111
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 126 | 67
Commercial | Agricultural | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 202 | 178
Commercial | Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 296,710 | 205,445
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 448,309 | 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 | $ 448,306 | $ 373,075

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