Loans (Composition of Total Loans Outstanding) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 934,971	$ 845,897
Less allowance for credit losses	(6,675)	(5,843)	$ (5,373)
Net loans	928,296	840,054
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	99,932	93,959
Less allowance for credit losses	(161)	(221)	(349)
Commercial Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	535,735	484,868
Less allowance for credit losses	(3,647)	(2,856)	(2,531)
Commercial Term [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	166,335	129,535
Less allowance for credit losses	(1,062)	(845)	(709)
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	76,302	75,014
Less allowance for credit losses	(1,032)	(1,128)	(969)
Consumer: Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	51,536	56,844
Less allowance for credit losses	(190)	(183)	(196)
Consumer: Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,131	5,677
Less allowance for credit losses	$ (46)	$ (63)	$ (61)