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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, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 64,439 | $ 93,989
Current | 13,953,003 | 14,331,715
Total | 14,017,442 | 14,425,704
90 Days Past Due & Accruing | 174 | 856
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 28,701 | 57,289
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 35,738 | 36,700
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,627 | 7,108
Current | 359,989 | 446,889
Total | 363,616 | 453,997
90 Days Past Due & Accruing | 101 | 259
Consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,974 | 5,732
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 653 | 1,376
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 934 | 1,489
Current | 171,946 | 203,313
Total | 172,880 | 204,802
90 Days Past Due & Accruing | 95 | 259
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 672 | 848
Consumer | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 262 | 641
Total | 262 |
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,693 | 5,619
Current | 188,043 | 243,576
Total | 190,736 | 249,195
90 Days Past Due & Accruing | 6 | 0
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,302 | 4,884
Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 391 | 735
Total | 391 |
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 47,386 | 61,072
Current | 9,935,867 | 10,960,868
Total | 9,983,253 | 11,021,940
90 Days Past Due & Accruing | 66 | 597
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 18,453 | 39,755
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 28,933 | 21,317
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,694 | 6,870
Current | 1,849,666 | 2,241,803
Total | 1,853,360 | 2,248,673
90 Days Past Due & Accruing | 0 | 0
Real Estate | Construction and development | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,168 | 5,792
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,526 | 1,078
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 26,692 | 40,107
Current | 1,970,378 | 2,374,646
Total | 1,997,070 | 2,414,753
90 Days Past Due & Accruing | 64 | 597
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 12,170 | 26,318
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 14,522 | 13,789
Total | 14,523 |
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 17,000 | 14,095
Current | 6,115,823 | 6,344,419
Total | 6,132,823 | 6,358,514
90 Days Past Due & Accruing | 2 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,115 | 7,645
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 11,885 | 6,450
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 13,426 | 25,809
Current | 3,136,059 | 2,616,835
Total | 3,149,485 | 2,642,644
90 Days Past Due & Accruing | 7 | 0
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 7,274 | 11,802
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,152 | 14,007
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 12,808 | 24,130
Current | 2,894,990 | 2,426,989
Total | 2,907,798 | 2,451,119
90 Days Past Due & Accruing | 7 | 0
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,984 | 10,579
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,824 | 13,551
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 618 | 1,679
Current | 241,069 | 189,846
Total | 241,687 | 191,525
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 290 | 1,223
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 328 | 456
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 521,088 | 307,123
Total | 521,088 | 307,123
90 Days Past Due & Accruing | 0 | $ 0
Other | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 |
Other | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 0 |

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