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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 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 11,386,352 | $ 12,900,897
90 Days Past Due & Accruing | 653 | 578
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 42,944 | 39,072
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 34,812 | 35,188
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 77,756 | 74,260
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,308,596 | 12,826,637
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 359,346 | 391,224
90 Days Past Due & Accruing | 132 | 269
Consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,588 | 3,479
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 394 | 558
Consumer | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,982 | 4,037
Consumer | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 357,364 | 387,187
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 177,634 | 188,845
90 Days Past Due & Accruing | 132 | 256
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 644 | 708
Consumer | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 273 | 256
Consumer | Credit cards | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 917 | 964
Consumer | Credit cards | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 176,717 | 187,881
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 181,712 | 202,379
90 Days Past Due & Accruing | 0 | 13
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 944 | 2,771
Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 121 | 302
Consumer | Other consumer | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,065 | 3,073
Consumer | Other consumer | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 180,647 | 199,306
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,368,848 | 9,223,791
90 Days Past Due & Accruing | 127 | 253
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 23,089 | 27,761
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 24,898 | 27,014
Real Estate | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 47,987 | 54,775
Real Estate | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,320,861 | 9,169,016
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,428,165 | 1,596,255
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 | 4,360 | 1,375
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,595 | 3,089
Real Estate | Construction and development | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,955 | 4,464
Real Estate | Construction and development | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,422,210 | 1,591,791
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,608,028 | 1,880,673
90 Days Past Due & Accruing | 0 | 253
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 6,883 | 23,726
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,061 | 14,339
Real Estate | Single family residential | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 14,944 | 38,065
Real Estate | Single family residential | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,593,084 | 1,842,608
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,332,655 | 5,746,863
90 Days Past Due & Accruing | 127 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,846 | 2,660
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 15,242 | 9,586
Real Estate | Other commercial | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 27,088 | 12,246
Real Estate | Other commercial | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,305,567 | 5,734,617
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,268,191 | 2,750,291
90 Days Past Due & Accruing | 394 | 56
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 18,267 | 7,740
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,520 | 7,616
Commercial | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 27,787 | 15,356
Commercial | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,240,404 | 2,734,935
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,074,729 | 2,574,386
90 Days Past Due & Accruing | 394 | 56
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 18,162 | 7,514
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,167 | 7,429
Commercial | Commercial | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 27,329 | 14,943
Commercial | Commercial | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,047,400 | 2,559,443
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 193,462 | 175,905
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 105 | 226
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 353 | 187
Commercial | Agricultural | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 458 | 413
Commercial | Agricultural | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 193,004 | 175,492
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 389,967 | 535,591
90 Days Past Due & Accruing | 0 | 0
Other | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 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 | 0 | 92
Other | Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 389,967 | $ 535,499

X
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