Loans (Schedule of Financing Receivable Recorded Investment Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Loans	$ 1,142,010	$ 1,088,982	$ 1,005,068
Residential First Mortgage Loans [Member]
Loans	181,386	171,004	148,138
Residential First Mortgage Loans [Member] | Performing Financing Receivable [Member]
Loans	181,098	170,381
Residential First Mortgage Loans [Member] | Nonperforming Financing Receivable [Member]
Loans	288	623
Home Equity And Second Mortgage Loans [Member]
Loans	20,847	21,399	22,104
Home Equity And Second Mortgage Loans [Member] | Performing Financing Receivable [Member]
Loans	20,795	21,338
Home Equity And Second Mortgage Loans [Member] | Nonperforming Financing Receivable [Member]
Loans	52	61
Consumer Loans [Member]
Loans	412	422	332
Consumer Loans [Member] | Performing Financing Receivable [Member]
Loans	412	422
Commercial Equipment Loans [Member]
Loans	34,589	39,737
Commercial Portfolio Segment [Member]
Loans	939,365	896,157
Commercial Portfolio Segment [Member] | Unrated [Member]
Loans	103,153	101,733
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	810,367	764,793
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans	1,019
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	24,826	29,494
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans		137
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member]
Loans	713,789	667,105	608,380
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Unrated [Member]
Loans	53,423	51,503
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Pass [Member]
Loans	639,970	594,768
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Special Mention [Member]
Loans	1,019
Commercial Portfolio Segment [Member] | Commercial Real Estate Loans [Member] | Substandard [Member]
Loans	19,377	20,834
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member]
Loans	103,361	101,897	100,202
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | Unrated [Member]
Loans	26,256	25,563
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | Pass [Member]
Loans	76,063	74,989
Commercial Portfolio Segment [Member] | Residential Rentals Loans [Member] | Substandard [Member]
Loans	1,042	1,345
Commercial Portfolio Segment [Member] | Construction And Land Development Loans [Member]
Loans	32,603	36,934	35,560
Commercial Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Unrated [Member]
Loans	1,820	1,632
Commercial Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Pass [Member]
Loans	29,801	31,525
Commercial Portfolio Segment [Member] | Construction And Land Development Loans [Member] | Substandard [Member]
Loans	982	3,777
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans	55,023	50,484	57,167
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Unrated [Member]
Loans	11,586	11,266
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member]
Loans	40,503	36,221
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member]
Loans	2,934	2,997
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member]
Loans	34,589	39,737	$ 33,185
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member] | Unrated [Member]
Loans	10,068	11,769
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member] | Pass [Member]
Loans	24,030	27,290
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member] | Substandard [Member]
Loans	$ 491	541
Commercial Portfolio Segment [Member] | Commercial Equipment Loans [Member] | Doubtful [Member]
Loans		$ 137