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Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 137,695 | $ 93,989
Current | 14,236,582 | 14,331,715
Total Loans | 14,374,277 | 14,425,704
90 Days Past Due & Accruing | 1,160 | 856
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 79,617 | 57,289
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 58,078 | 36,700
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,862 | 7,108
Current | 449,604 | 446,889
Total Loans | 456,466 | 453,997
90 Days Past Due & Accruing | 115 | 259
Consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,406 | 5,732
Consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,456 | 1,376
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,191 | 1,489
Current | 187,405 | 203,313
Total Loans | 188,596 | 204,802
90 Days Past Due & Accruing | 115 | 259
Consumer | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 866 | 848
Consumer | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 325 | 641
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,671 | 5,619
Current | 262,199 | 243,576
Total Loans | 267,870 | 249,195
90 Days Past Due & Accruing | 0 | 0
Consumer | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,540 | 4,884
Consumer | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,131 | 735
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 88,405 | 61,072
Current | 10,745,360 | 10,960,868
Total Loans | 10,833,765 | 11,021,940
90 Days Past Due & Accruing | 322 | 597
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 57,473 | 39,755
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 30,932 | 21,317
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 7,726 | 6,870
Current | 2,016,392 | 2,241,803
Total Loans | 2,024,118 | 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 | 2,713 | 5,792
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,013 | 1,078
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 46,482 | 40,107
Current | 2,297,061 | 2,374,646
Total Loans | 2,343,543 | 2,414,753
90 Days Past Due & Accruing | 321 | 597
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 31,236 | 26,318
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 15,246 | 13,789
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 34,197 | 14,095
Current | 6,431,907 | 6,344,419
Total Loans | 6,466,104 | 6,358,514
90 Days Past Due & Accruing | 1 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 23,524 | 7,645
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 10,673 | 6,450
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 42,428 | 25,809
Current | 2,463,579 | 2,616,835
Total Loans | 2,506,007 | 2,642,644
90 Days Past Due & Accruing | 723 | 0
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 16,738 | 11,802
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 25,690 | 14,007
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 41,491 | 24,130
Current | 2,272,981 | 2,426,989
Total Loans | 2,314,472 | 2,451,119
90 Days Past Due & Accruing | 723 | 0
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 16,361 | 10,579
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 25,130 | 13,551
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 937 | 1,679
Current | 190,598 | 189,846
Total Loans | 191,535 | 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 | 377 | 1,223
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 560 | 456
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 578,039 | 307,123
Total Loans | 578,039 | 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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