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Summary of Significant Accounting Policies - Narrative (Details) |  |  | 3 Months Ended
--- | --- | --- | ---
Jun. 16, 2017 shares | Jan. 27, 2017 USD ($) shares | Mar. 31, 2018 USD ($) market | Mar. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of markets entity operates | market |  |  | 11 |
Reduction in tax expense | $ |  |  | $ (19,633,000) | $ (13,791,000)
Underwritten public offering |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net proceeds of offering | $ |  | $ 192,200,000 |  |
Shares issued (in shares) |  | 3,220,000 |  |
Over-allotment option |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Shares issued (in shares) |  | 420,000 |  |
Bankers Healthcare Group, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership interest (as percent) |  |  | 49.00% |
Common Stock | BNC Bancorp |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Common stock issued in conjunction with acquisition (in shares) | 27,687,100 |  |  |

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