Loans (Schedule of Financing Receivable Recorded Investment Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loans	$ 1,150,044	$ 1,088,982
Commercial Real Estate Portfolio Segment [Member]
Loans	727,314	667,105
Commercial Real Estate Portfolio Segment [Member] | Unrated [Member]
Loans	75,581	51,503
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans	619,604	594,768
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans	32,129	20,834
Residential First Mortgages Portfolio Segment [Member]
Loans	170,374	171,004
Residential First Mortgages Portfolio Segment [Member] | Performing Financing Receivable [Member]
Loans	169,896	170,381
Residential First Mortgages Portfolio Segment [Member] | Nonperforming Financing Receivable [Member]
Loans	478	623
Residential Rentals Portfolio Segment [Member]
Loans	110,228	101,897
Residential Rentals Portfolio Segment [Member] | Unrated [Member]
Loans	28,428	25,563
Residential Rentals Portfolio Segment [Member] | Pass [Member]
Loans	80,279	74,989
Residential Rentals Portfolio Segment [Member] | Substandard [Member]
Loans	1,521	1,345
Construction And Land Development Portfolio Segment [Member]
Loans	27,871	36,934
Construction And Land Development Portfolio Segment [Member] | Unrated [Member]
Loans	1,775	1,632
Construction And Land Development Portfolio Segment [Member] | Pass [Member]
Loans	25,367	31,525
Construction And Land Development Portfolio Segment [Member] | Substandard [Member]
Loans	729	3,777
Home Equity And Second Mortgages Portfolio Segment [Member]
Loans	21,351	21,399
Home Equity And Second Mortgages Portfolio Segment [Member] | Performing Financing Receivable [Member]
Loans	21,217	21,338
Home Equity And Second Mortgages Portfolio Segment [Member] | Nonperforming Financing Receivable [Member]
Loans	134	61
Commercial Portfolio [Member]
Loans	957,746	896,157
Commercial Portfolio [Member] | Unrated [Member]
Loans	130,996	101,733
Commercial Portfolio [Member] | Pass [Member]
Loans	787,949	764,793
Commercial Portfolio [Member] | Substandard [Member]
Loans	38,801	29,494
Commercial Portfolio [Member] | Doubtful [Member]
Loans		137
Commercial Portfolio Segment [Member]
Loans	56,417	50,484
Commercial Portfolio Segment [Member] | Unrated [Member]
Loans	14,356	11,266
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	39,118	36,221
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	2,943	2,997
Commercial Equipment Portfolio Segment [Member]
Loans	35,916	39,737
Commercial Equipment Portfolio Segment [Member] | Unrated [Member]
Loans	10,856	11,769
Commercial Equipment Portfolio Segment [Member] | Pass [Member]
Loans	23,581	27,290
Commercial Equipment Portfolio Segment [Member] | Substandard [Member]
Loans	1,479	541
Commercial Equipment Portfolio Segment [Member] | Doubtful [Member]
Loans		137
Consumer Portfolio Segment [Member]
Loans	573	422
Consumer Portfolio Segment [Member] | Performing Financing Receivable [Member]
Loans	$ 573	$ 422