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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, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 10,825,227 | $ 12,900,897
90 Days Past Due & Accruing | 334 | 578
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 15,646 | 39,072
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 27,820 | 35,188
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 43,466 | 74,260
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 10,781,761 | 12,826,637
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 358,376 | 391,224
90 Days Past Due & Accruing | 155 | 269
Consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,676 | 3,479
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 343 | 558
Consumer | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,019 | 4,037
Consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 356,357 | 387,187
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 175,884 | 188,845
90 Days Past Due & Accruing | 154 | 256
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 751 | 708
Consumer | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 253 | 256
Consumer | Credit cards | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,004 | 964
Consumer | Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 174,880 | 187,881
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 182,492 | 202,379
90 Days Past Due & Accruing | 1 | 13
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 925 | 2,771
Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 90 | 302
Consumer | Other consumer | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,015 | 3,073
Consumer | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 181,477 | 199,306
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,079,343 | 9,223,791
90 Days Past Due & Accruing | 80 | 253
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,693 | 27,761
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 20,379 | 27,014
Real Estate | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 32,072 | 54,775
Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,047,271 | 9,169,016
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,229,740 | 1,596,255
90 Days Past Due & Accruing | 5 | 0
Real Estate | Construction and development | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,854 | 1,375
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 605 | 3,089
Real Estate | Construction and development | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,459 | 4,464
Real Estate | Construction and development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,226,281 | 1,591,791
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,540,701 | 1,880,673
90 Days Past Due & Accruing | 75 | 253
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 6,546 | 23,726
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 6,154 | 14,339
Real Estate | Single family residential | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,700 | 38,065
Real Estate | Single family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,528,001 | 1,842,608
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,308,902 | 5,746,863
90 Days Past Due & Accruing | 0 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,293 | 2,660
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,620 | 9,586
Real Estate | Other commercial | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 15,913 | 12,246
Real Estate | Other commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,292,989 | 5,734,617
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,038,640 | 2,750,291
90 Days Past Due & Accruing | 99 | 56
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,270 | 7,740
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,098 | 7,616
Commercial | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,368 | 15,356
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,029,272 | 2,734,935
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,821,905 | 2,574,386
90 Days Past Due & Accruing | 99 | 56
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,130 | 7,514
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 6,639 | 7,429
Commercial | Commercial | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,769 | 14,943
Commercial | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,813,136 | 2,559,443
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 216,735 | 175,905
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 140 | 226
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 459 | 187
Commercial | Agricultural | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 599 | 413
Commercial | Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 216,136 | 175,492
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 348,868 | 535,591
90 Days Past Due & Accruing | 0 | 0
Other | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7 | 92
Other | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Other | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7 | 92
Other | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 348,861 | $ 535,499

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