Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Increase in income tax expense	$ 400
Decrease in deferred tax asset	400
Current federal tax	(3,923)	$ (3,632)	$ (2,714)
Current state tax	(2,304)	(2,055)	(1,502)
Total current	(6,227)	(5,687)	(4,216)
Deferred federal tax	(446)	(291)	169
Deferred state tax	0	(168)	98
Total deferred	(446)	(459)	267
Income tax expense	(6,673)	(6,146)	(3,949)
Federal tax expense at 34% statutory rate	(4,684)	(4,629)	(3,003)
State income taxes, net of federal benefit	(1,543)	(1,517)	(946)
Corporate income tax rate adjustment	$ (446)	$ 0	$ 0
Effective income tax rate, percent	48.50%	44.80%	44.70%
Federal statutory income tax rate	34.00%	34.00%	34.00%