Loans (Schedule of Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 509,475		$ 481,758
Less allowance for credit losses	(5,303)	$ (5,247)	(4,935)	$ (4,729)	$ (5,108)	$ (4,906)
Net loans	504,172		476,823
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	28,379		28,651
Less allowance for credit losses	(403)	(314)	(216)	(194)	(265)	(269)
Commercial Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	287,638		274,132
Less allowance for credit losses	(2,472)	(2,370)	(2,375)	(2,491)	(2,562)	(2,300)
Commercial Term [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	104,755		102,178
Less allowance for credit losses	(793)	(891)	(989)	(719)	(721)	(709)
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	29,677		20,364
Less allowance for credit losses	(873)	(866)	(569)	(678)	(774)	(881)
Consumer: Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	53,175		51,270
Less allowance for credit losses	(202)	(191)	(195)	(200)	(190)	(189)
Consumer: Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,851		5,163
Less allowance for credit losses	$ (62)	$ (64)	$ (64)	$ (66)	$ (65)	$ (70)