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Loans and Allowance for Credit Losses - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | $ 131,383 | $ 93,330
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 2,135 | 2,087
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 223 | 382
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 1,912 | 1,705
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 75,000 | 49,566
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 6,501 | 5,289
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 32,244 | 27,695
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 36,255 | 16,582
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 54,248 | 41,677
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 53,538 | 40,924
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | $ 710 | $ 753

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