Loans (Schedule of Financing Receivables, Non-Accrual Status) (Details) $ in Thousands	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 2,483	$ 7,705
Number of loans, 90 or greater days delinquent | loan	16	27
Non-accrual performing loans | $	$ 2,210	$ 669
Number of loans, non-accrual performing loans | loan	8	2
Total non-accrual loans | $	$ 4,693	$ 8,374
Total number of loans | loan	24	29
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 1,148	$ 2,371
Number of loans, 90 or greater days delinquent | loan	4	7
Non-accrual performing loans | $	$ 839
Number of loans, non-accrual performing loans | loan	3
Total non-accrual loans | $	$ 1,987	$ 2,371
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 | $	$ 478	$ 623
Number of loans, 90 or greater days delinquent | loan	3	4
Non-accrual performing loans | $	$ 507
Number of loans, non-accrual performing loans | loan	1
Total non-accrual loans | $	$ 985	$ 623
Total number of loans | loan	4	4
Residential Rentals Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 84	$ 577
Number of loans, 90 or greater days delinquent | loan	1	4
Non-accrual performing loans | $	$ 741
Number of loans, non-accrual performing loans | loan	3
Total non-accrual loans | $	$ 825	$ 577
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
Number of loans, 90 or greater days delinquent | loan		2
Total non-accrual loans | $		$ 3,048
Total number of loans | loan		2
Home Equity And Second Mortgages Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 134	$ 61
Number of loans, 90 or greater days delinquent | loan	3	2
Non-accrual performing loans | $	$ 123
Number of loans, non-accrual performing loans | loan	1
Total non-accrual loans | $	$ 257	$ 61
Total number of loans | loan	4	2
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 172	$ 375
Number of loans, 90 or greater days delinquent | loan	2	3
Non-accrual performing loans | $		$ 669
Number of loans, non-accrual performing loans | loan		2
Total non-accrual loans | $	$ 172	$ 1,044
Total number of loans | loan	2	5
Commercial Equipment Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
90 or greater days delinquent | $	$ 467	$ 650
Number of loans, 90 or greater days delinquent | loan	3	5
Total non-accrual loans | $	$ 467	$ 650
Total number of loans | loan	3	5