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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, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | $ 59,054 | $ 122,879
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 781 | 1,520
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 390 | 301
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 391 | 1,219
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 41,236 | 55,842
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 2,330 | 3,625
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 21,068 | 28,062
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 17,838 | 24,155
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 17,037 | 65,517
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 16,532 | 65,244
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | $ 505 | $ 273

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