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Loans Acquired - Carrying Value of all Acquired Impaired Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquired loans | $ 13,002,952 |  | $ 11,723,171 |  |  |
Allowance for loan losses | 66,590 | $ 64,179 | 56,694 | $ 56,703 | $ 53,776 | $ 42,086
Loans Acquired |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquired loans | 3,359,587 |  | 3,292,783 |  |  |
Allowance for loan losses | 597 | $ 1,112 | 95 | $ 1,345 | $ 2,044 | $ 418
Loans Acquired | Consumer | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquired loans | 7,431 |  | 15,658 |  |  |
Loans Acquired | Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquired loans | 3,001,463 |  | 2,844,472 |  |  |
Loans Acquired | Real Estate | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquired loans | 362,000 |  | 429,605 |  |  |
Loans Acquired | Real Estate | Single family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquired loans | 504,490 |  | 566,188 |  |  |
Loans Acquired | Real Estate | Other commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquired loans | 2,134,973 |  | 1,848,679 |  |  |
Loans Acquired | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquired loans | 350,693 |  | 432,653 |  |  |
Loans Acquired | Commercial | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquired loans | 349,821 |  | 430,914 |  |  |
Loans Acquired | Commercial | Agricultural |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Acquired loans | $ 872 |  | $ 1,739 |  |  |

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