Loans (Schedule of Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 817,529	$ 481,758
Less allowance for credit losses	(5,373)	(4,935)	$ (4,906)
Net loans	812,156	476,823
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	87,581	28,651
Less allowance for credit losses	(349)	(216)	(269)
Commercial Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	465,486	274,132
Less allowance for credit losses	(2,531)	(2,375)	(2,300)
Commercial Term [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	123,175	102,178
Less allowance for credit losses	(709)	(989)	(709)
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	72,755	20,364
Less allowance for credit losses	(969)	(569)	(881)
Consumer: Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	62,560	51,270
Less allowance for credit losses	(196)	(195)	(189)
Consumer: Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,972	5,163
Less allowance for credit losses	$ (61)	$ (64)	$ (70)