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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, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 15,607,135 | $ 12,012,503
90 Days Past Due & Accruing | 242 | 349
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 24,940 | 20,722
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 28,486 | 32,907
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 53,426 | 53,629
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 15,553,709 | 11,958,874
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 373,163 | 355,370
90 Days Past Due & Accruing | 201 | 247
Consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,162 | 1,996
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 386 | 543
Consumer | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,548 | 2,539
Consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 370,615 | 352,831
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 192,559 | 187,052
90 Days Past Due & Accruing | 201 | 247
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,348 | 847
Consumer | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 267 | 413
Consumer | Credit cards | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,615 | 1,260
Consumer | Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 190,944 | 185,792
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 180,604 | 168,318
90 Days Past Due & Accruing | 0 | 0
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 814 | 1,149
Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 119 | 130
Consumer | Other consumer | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 933 | 1,279
Consumer | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 179,671 | 167,039
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,089,193 | 9,167,250
90 Days Past Due & Accruing | 0 | 102
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 18,249 | 13,901
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 21,063 | 22,170
Real Estate | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 39,312 | 36,071
Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,049,881 | 9,131,179
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,372,294 | 1,326,371
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 | 1,613 | 114
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,631 | 504
Real Estate | Construction and development | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,244 | 618
Real Estate | Construction and development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,369,050 | 1,325,753
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,467,008 | 2,101,975
90 Days Past Due & Accruing | 0 | 102
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,175 | 11,313
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,250 | 9,398
Real Estate | Single family residential | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 22,425 | 20,711
Real Estate | Single family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,444,583 | 2,081,264
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,249,891 | 5,738,904
90 Days Past Due & Accruing | 0 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,461 | 2,474
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,182 | 12,268
Real Estate | Other commercial | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,643 | 14,742
Real Estate | Other commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,236,248 | 5,724,162
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,788,757 | 2,160,760
90 Days Past Due & Accruing | 41 | 0
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,529 | 4,825
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,034 | 10,191
Commercial | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,563 | 15,016
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,777,194 | 2,145,744
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,525,218 | 1,992,043
90 Days Past Due & Accruing | 41 | 0
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,474 | 4,812
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,008 | 10,074
Commercial | Commercial | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,482 | 14,886
Commercial | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,513,736 | 1,977,157
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 263,539 | 168,717
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 55 | 13
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 26 | 117
Commercial | Agricultural | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 81 | 130
Commercial | Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 263,458 | 168,587
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 356,022 | 329,123
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 | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3 | 3
Other | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 356,019 | $ 329,120

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