Loan Quality (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Residential properties in the process of foreclosure	$ 132	$ 123
Interest not recognized on nonaccrual loans	159	175	$ 335
Impaired loans balances, general allocation pool	677
Impaired loans	12,600	$ 15,100
Maximum [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Impaired loans balances, added to general allocation pool	$ 250