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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Taxes [Line Items] |  |  |  |  |
Deferred tax liability increased due to change in taxable status |  | $ 13,181 |  |  |
Statutory federal income tax rate | 35.00% |  | 35.00% | 35.00% | 35.00%
Deferred income tax expense related to unrealized gain on available for sale securities | $ 2,527 |  | $ 97 | $ 7,952 | $ 1,046
C Corporation |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred income tax expense related to unrealized gain on available for sale securities |  | $ 2,955 |  |  |

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