Income Taxes - Components of income tax expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current Federal income tax expense	$ 2,945	$ (125)	$ 2,217
Current State income tax expense (benefit)	570	(37)	(445)
Total current income tax expense	3,515	(162)	1,772
Deferred Federal income tax expense (benefit)	(1,208)	(397)	(645)
Deferred State income tax expense (benefit)	275	(11)	220
Total deferred income tax expense (benefit)	(933)	(408)	(425)
Provision (benefit) from income taxes, Federal	1,737	(522)	1,572
Provision (benefit) from income taxes, State	845	(48)	(225)
Provision for income taxes	$ 2,582	$ (570)	$ 1,347