Federal Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal Income Taxes [Abstract]
Tax provision at statutory rate									$ 3,192	$ 4,241	$ 3,539
Income on tax-exempt loans and securities									(1,751)	(1,566)	(1,466)
Nondeductible interest expense relating to carrying tax-exempt obligations									24	22	28
Dividends received exclusion										(2)	(7)
Income from bank owned life insurance									(210)	(182)	(163)
Life insurance proceeds										(35)
Change in valuation allowance										(200)
Stock option compensation									30	25
Other, net									17	(32)	75
Income tax provision	$ 104	$ 383	$ 130	$ 685	$ 493	$ 306	$ 632	$ 839	$ 1,302	$ 2,271	$ 2,006
Effective income tax rate									13.90%	18.20%	19.30%
Statutory rate									34.00%	34.00%	34.00%