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Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | $ 14,017,442 | $ 14,425,704
Consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 363,616 | 453,997
Consumer | Credit cards |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 172,880 | 204,802
Consumer | Other consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 190,736 | 249,195
Real Estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 9,983,253 | 11,021,940
Real Estate | Construction and development |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 1,853,360 | 2,248,673
Real Estate | Single family residential |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 1,997,070 | 2,414,753
Real Estate | Other commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 6,132,823 | 6,358,514
Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 3,149,485 | 2,642,644
Commercial | Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 2,907,798 | 2,451,119
Commercial | Agricultural |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | 241,687 | 191,525
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Total loans | $ 521,088 | $ 307,123

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