Federal Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2017	[1]	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
Federal Income Taxes [Abstract]
Current tax expense										$ 4,396	$ 2,134	$ 2,382
Deferred tax expense (benefit)										(831)	(832)	(111)
Income tax provision	$ 1,048		$ 774	$ 950	$ 793	$ 104	$ 383	$ 130	$ 685	$ 3,565	$ 1,302	$ 2,271

[1] Includes $2.3 million for revaluation of the net deferred tax assets