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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, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 74,260 | $ 93,989
Current | 12,826,637 | 14,331,715
Total Loans | 12,900,897 | 14,425,704
90 Days Past Due & Accruing | 578 | 856
Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 39,072 | 57,289
90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 35,188 | 36,700
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 4,037 | 7,108
Current | 387,187 | 447,388
Total Loans | 391,224 | 454,496
90 Days Past Due & Accruing | 269 | 259
Consumer | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 3,479 | 5,732
Consumer | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 558 | 1,376
Consumer | Credit cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 964 | 1,489
Current | 179,390 | 203,313
Total Loans | 180,354 | 204,802
90 Days Past Due & Accruing | 256 | 259
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 708 | 848
Consumer | Credit cards | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 256 | 641
Total Loans | 256 |
Consumer | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 3,073 | 5,619
Current | 207,797 | 244,075
Total Loans | 210,870 | 249,694
90 Days Past Due & Accruing | 13 | 0
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 2,771 | 4,884
Consumer | Other consumer | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 302 | 735
Total Loans | 302 |
Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 54,775 | 61,072
Current | 9,169,016 | 10,823,452
Total Loans | 9,223,791 | 10,884,524
90 Days Past Due & Accruing | 253 | 597
Real Estate | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 27,761 | 39,755
Real Estate | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 27,014 | 21,317
Real Estate | Construction and development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 4,464 | 6,870
Current | 1,591,791 | 2,229,991
Total Loans | 1,596,255 | 2,236,861
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 Past Due | 1,375 | 5,792
Real Estate | Construction and development | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 3,089 | 1,078
Real Estate | Single family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 38,065 | 40,107
Current | 1,842,608 | 2,401,957
Total Loans | 1,880,673 | 2,442,064
90 Days Past Due & Accruing | 253 | 597
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 23,726 | 26,318
Real Estate | Single family residential | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 14,339 | 13,789
Total Loans | 14,339 |
Real Estate | Other commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 12,246 | 14,095
Current | 5,734,617 | 6,191,504
Total Loans | 5,746,863 | 6,205,599
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 Past Due | 2,660 | 7,645
Real Estate | Other commercial | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 9,586 | 6,450
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 15,356 | 25,809
Current | 2,734,935 | 2,785,161
Total Loans | 2,750,291 | 2,810,970
90 Days Past Due & Accruing | 56 | 0
Commercial | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 7,740 | 11,802
Commercial | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 7,616 | 14,007
Commercial | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 14,943 | 24,130
Current | 2,559,443 | 2,471,386
Total Loans | 2,574,386 | 2,495,516
90 Days Past Due & Accruing | 56 | 0
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 7,514 | 10,579
Commercial | Commercial | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 7,429 | 13,551
Commercial | Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 413 | 1,679
Current | 175,492 | 313,775
Total Loans | 175,905 | 315,454
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 226 | 1,223
Commercial | Agricultural | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 187 | 456
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 92 | 0
Current | 535,499 | 275,714
Total Loans | 535,591 | 275,714
90 Days Past Due & Accruing | 0 | $ 0
Other | Gross 30-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 92 |
Other | 90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 0 |

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