Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Taxes [Line Items]
Increase in deferred tax liability due to change in taxable status	$ 13,181		$ 13,181
Statutory federal income tax rate	35.00%	35.00%	35.00%	35.00%
State income tax rate	6.50%	6.50%	6.50%	6.50%
Deferred income tax expense related to unrealized gain on available for sale securities	$ 13,193	$ 453	$ 14,239	$ 1,177
C Corporation
Income Taxes [Line Items]
Increase in deferred tax liability due to change in taxable status	$ 13,181		13,181
Deferred income tax expense related to unrealized gain on available for sale securities			$ 2,955