Loans (Schedule of Financing Receivable Recorded Investment Credit Quality Indicator) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Loans	$ 1,307,737	$ 1,150,044	$ 1,145,406
Unrated [Member]
Loans	328,813	283,612
Pass [Member]
Loans	950,284	826,030
Special Mention [Member]
Loans		96
Substandard [Member]
Loans	28,640	40,306
Commercial Real Estate Loans [Member]
Loans	847,945	727,314	712,840
Commercial Real Estate Loans [Member] | Unrated [Member]
Loans	111,356	75,581
Commercial Real Estate Loans [Member] | Pass [Member]
Loans	715,844	619,604
Commercial Real Estate Loans [Member] | Substandard [Member]
Loans	20,745	32,129
Residential First Mortgage Loans [Member]
Loans	156,565	170,374	175,816
Residential First Mortgage Loans [Member] | Performing Financing Receivable [Member]
Loans	156,362	169,896
Residential First Mortgage Loans [Member] | Nonperforming Financing Receivable [Member]
Loans	203	478
Residential First Mortgage Loans [Member] | Classified Loans By Payment Activity [Member]
Loans	156,565	170,374
Residential Rentals Loans [Member]
Loans	125,383	110,228	110,905
Residential Rentals Loans [Member] | Unrated [Member]
Loans	36,332	28,428
Residential Rentals Loans [Member] | Pass [Member]
Loans	87,905	80,279
Residential Rentals Loans [Member] | Substandard [Member]
Loans	1,146	1,521
Construction And Land Development Loans [Member]
Loans	28,788	27,871	31,094
Construction And Land Development Loans [Member] | Unrated [Member]
Loans	2,320	1,775
Construction And Land Development Loans [Member] | Pass [Member]
Loans	25,739	25,367
Construction And Land Development Loans [Member] | Substandard [Member]
Loans	729	729
Home Equity And Second Mortgage Loans [Member]
Loans	36,360	21,351	22,334
Home Equity And Second Mortgage Loans [Member] | Performing Financing Receivable [Member]
Loans	36,210	21,217
Home Equity And Second Mortgage Loans [Member] | Nonperforming Financing Receivable [Member]
Loans	150	134
Home Equity And Second Mortgage Loans [Member] | Classified Loans By Payment Activity [Member]
Loans	36,360	21,351
Commercial Loans [Member]
Loans	62,083	56,417	56,376
Commercial Loans [Member] | Unrated [Member]
Loans	19,507	14,356
Commercial Loans [Member] | Pass [Member]
Loans	39,811	39,118
Commercial Loans [Member] | Substandard [Member]
Loans	2,765	2,943
Consumer Loans [Member]
Loans	730	573	541
Consumer Loans [Member] | Performing Financing Receivable [Member]
Loans	730	573
Consumer Loans [Member] | Classified Loans By Payment Activity [Member]
Loans	730	573
Commercial Equipment Loans [Member]
Loans	49,883	35,916	$ 35,500
Commercial Equipment Loans [Member] | Unrated [Member]
Loans	14,495	10,856
Commercial Equipment Loans [Member] | Pass [Member]
Loans	33,934	23,581
Commercial Equipment Loans [Member] | Substandard [Member]
Loans	1,454	1,479
Commercial Portfolio Segment [Member]
Loans	1,114,082	957,746
Commercial Portfolio Segment [Member] | Unrated [Member]
Loans	184,010	130,996
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	903,233	787,949
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	26,839	38,801
Non Commercial Portfolio Segment [Member]
Loans	193,655	192,298
Non Commercial Portfolio Segment [Member] | Unrated [Member]
Loans	144,803	152,616
Non Commercial Portfolio Segment [Member] | Pass [Member]
Loans	47,051	38,081
Non Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans		96
Non Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	$ 1,801	$ 1,505