Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Computed expected income tax expense (benefit) at statutory regulatory tax rate									$ (5,800)	$ 2,967	$ 11,160
Meals and entertainment									81	81	32
Tax exempt interest									(987)	(1,164)	(1,259)
Dividends received deduction									(196)	(133)	(141)
State taxes (net of federal benefit)									165	203	176
Tax law change									1,276
True up bond amortization									464
Other									(22)	(2)	55
Income tax expense (benefit)	$ (5,338)	$ 35	$ (1,568)	$ 1,852	$ (2,512)	$ 2,128	$ 421	$ 1,915	(5,019)	1,952	10,023
Current income tax (benefit) expense									(3,444)	1,547	11,053
Deferred income tax expense (benefit)									(1,575)	405	(1,030)
Income tax (benefit) expense	$ (5,338)	$ 35	$ (1,568)	$ 1,852	$ (2,512)	$ 2,128	$ 421	$ 1,915	$ (5,019)	$ 1,952	$ 10,023