Income Taxes - Summary of Income Tax Expense Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal	$ 653	$ 578	$ 310
State	30	61	12
Deferred
Federal	12,163	10,818	3,440
State	2,043	2,070	782
Income tax provision (benefit)	$ 14,889	$ 13,527	$ 4,544