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Loans and Allowance for Credit Losses - Nonaccrual 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] |  |
Loans in nonaccrual status | $ 167,713 | $ 93,330
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 1,624 | 2,087
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 253 | 382
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 1,371 | 1,705
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 115,313 | 49,566
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 3,806 | 5,289
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 31,080 | 27,695
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 80,427 | 16,582
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 50,776 | 41,677
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 50,239 | 40,924
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | $ 537 | $ 753

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