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Loans and Allowance for Loan Losses - Nonaccrual Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | $ 72,721 | $ 34,201
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 2,155 | 2,455
Consumer | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 521 | 296
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 1,634 | 2,159
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 34,981 | 20,413
Real Estate | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 1,805 | 1,269
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 16,191 | 11,939
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 16,985 | 7,205
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 35,585 | 11,333
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | 35,018 | 10,049
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans in nonaccrual status | $ 567 | $ 1,284

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