Income Taxes - Summary of Change in Deferred Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Consolidated statements of income	$ (424)	$ 1,292	$ 71
Consolidated statements of stockholders' equity	1,340	465	1,262
Net change in deferred income tax	$ 916	$ 1,757	$ 1,333