Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal:
Current	$ 862	$ (1,266)	$ (758)
Deferred	64	255	1,146
Federal	926	(1,011)	388
State:
Current	353	(120)	(145)
Deferred	41	(152)	253
State	394	(272)	108
(Benefit) provision for income taxes	$ 1,320	$ (1,283)	$ 496