Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current expense, Federal	$ 14,627	$ 3,736	$ 6,020
Tax credit/ True-up, Federal	(312)	274	(2,176)
Change in deferred benefit, Federal	(369)	7,016	803
Income tax expense, Federal	13,946	11,026	4,647
Current expense, State	2,368	1,640	1,374
Tax credit/ True-up, State	0	0	0
Change in deferred benefit, State	(467)	(1,518)	1,549
Income tax expense, State	1,901	122	2,923
Current expense, Total	16,995	5,376	7,394
Tax credit/ True-up, Total	(312)	274	(2,176)
Change in deferred benefit, Total	(836)	5,498	2,352
Total provision	$ 15,847	$ 11,148	$ 7,570