Loans (Schedule of Financing Receivables, Non-Accrual Status) (Details) $ in Thousands	Dec. 31, 2016 USD ($) loan	Dec. 31, 2015 USD ($) loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 7,705	$ 10,740
Number of loans, 90 or greater days delinquent | loan	27	36
Non-accrual performing loans | $	$ 669	$ 693
Number of loans, non-accrual performing loans | loan	2	2
Total non-accrual loans | $	$ 8,374	$ 11,433
Total number of loans | loan	29	38
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 2,371	$ 2,875
Number of loans, 90 or greater days delinquent | loan	7	7
Total non-accrual loans | $	$ 2,371	$ 2,875
Total number of loans | loan	7	7
Residential First Mortgages Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 623	$ 1,948
Number of loans, 90 or greater days delinquent | loan	4	7
Total non-accrual loans | $	$ 623	$ 1,948
Total number of loans | loan	4	7
Residential Rentals Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 577	$ 605
Number of loans, 90 or greater days delinquent | loan	4	4
Total non-accrual loans | $	$ 577	$ 605
Total number of loans | loan	4	4
Construction And Land Development Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 3,048	$ 3,555
Number of loans, 90 or greater days delinquent | loan	2	3
Total non-accrual loans | $	$ 3,048	$ 3,555
Total number of loans | loan	2	3
Home Equity And Second Mortgages Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 61	$ 48
Number of loans, 90 or greater days delinquent | loan	2	3
Total non-accrual loans | $	$ 61	$ 48
Total number of loans | loan	2	3
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 375	$ 1,361
Number of loans, 90 or greater days delinquent | loan	3	8
Non-accrual performing loans | $	$ 669	$ 693
Number of loans, non-accrual performing loans | loan	2	2
Total non-accrual loans | $	$ 1,044	$ 2,054
Total number of loans | loan	5	10
Commercial Equipment Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 650	$ 348
Number of loans, 90 or greater days delinquent | loan	5	4
Total non-accrual loans | $	$ 650	$ 348
Total number of loans | loan	5	4