Federal Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Composition of income tax expense (benefit)
Current	$ 916	$ 451	$ (8)
Deferred	303	451	96
Federal income tax expense (benefit)	$ 1,219	$ 902	$ 88