Federal Income Taxes (Schedule of Components of Income Tax Expense(Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal Income Taxes [Abstract]
Current tax expense									$ 145	$ 502	$ 3,177
Deferred tax expense (benefit)									367	(91)	(240)
Federal income tax expense	(382)	318	356	218	512	(301)	(447)	646	512	411	2,937
Income tax provision	$ (382)	$ 318	$ 356	$ 218	$ 512	$ (301)	$ (447)	$ 646	$ 512	$ 411	$ 2,937