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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 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 12,012,503 | $ 12,900,897
90 Days Past Due & Accruing | 349 | 578
Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 20,722 | 39,072
90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 32,907 | 35,188
Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 53,629 | 74,260
Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 11,958,874 | 12,826,637
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 355,370 | 391,224
90 Days Past Due & Accruing | 247 | 269
Consumer | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,996 | 3,479
Consumer | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 543 | 558
Consumer | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,539 | 4,037
Consumer | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 352,831 | 387,187
Consumer | Credit cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 187,052 | 188,845
90 Days Past Due & Accruing | 247 | 256
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 847 | 708
Consumer | Credit cards | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 413 | 256
Consumer | Credit cards | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,260 | 964
Consumer | Credit cards | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 185,792 | 187,881
Consumer | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 168,318 | 202,379
90 Days Past Due & Accruing | 0 | 13
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,149 | 2,771
Consumer | Other consumer | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 130 | 302
Consumer | Other consumer | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,279 | 3,073
Consumer | Other consumer | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 167,039 | 199,306
Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 9,167,250 | 9,223,791
90 Days Past Due & Accruing | 102 | 253
Real Estate | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 13,901 | 27,761
Real Estate | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 22,170 | 27,014
Real Estate | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 36,071 | 54,775
Real Estate | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 9,131,179 | 9,169,016
Real Estate | Construction and development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,326,371 | 1,596,255
90 Days Past Due & Accruing | 0 | 0
Real Estate | Construction and development | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 114 | 1,375
Real Estate | Construction and development | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 504 | 3,089
Real Estate | Construction and development | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 618 | 4,464
Real Estate | Construction and development | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,325,753 | 1,591,791
Real Estate | Single family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,101,975 | 1,880,673
90 Days Past Due & Accruing | 102 | 253
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 11,313 | 23,726
Real Estate | Single family residential | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 9,398 | 14,339
Real Estate | Single family residential | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 20,711 | 38,065
Real Estate | Single family residential | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,081,264 | 1,842,608
Real Estate | Other commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 5,738,904 | 5,746,863
90 Days Past Due & Accruing | 0 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,474 | 2,660
Real Estate | Other commercial | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 12,268 | 9,586
Real Estate | Other commercial | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 14,742 | 12,246
Real Estate | Other commercial | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 5,724,162 | 5,734,617
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,160,760 | 2,750,291
90 Days Past Due & Accruing | 0 | 56
Commercial | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,825 | 7,740
Commercial | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 10,191 | 7,616
Commercial | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 15,016 | 15,356
Commercial | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,145,744 | 2,734,935
Commercial | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,992,043 | 2,574,386
90 Days Past Due & Accruing | 0 | 56
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,812 | 7,514
Commercial | Commercial | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 10,074 | 7,429
Commercial | Commercial | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 14,886 | 14,943
Commercial | Commercial | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,977,157 | 2,559,443
Commercial | Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 168,717 | 175,905
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 13 | 226
Commercial | Agricultural | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 117 | 187
Commercial | Agricultural | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 130 | 413
Commercial | Agricultural | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 168,587 | 175,492
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 329,123 | 535,591
90 Days Past Due & Accruing | 0 | 0
Other | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 0 | 92
Other | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 3 | 0
Other | Total Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 3 | 92
Other | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 329,120 | $ 535,499

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