Loans (Information on Non-Accrual Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 6,862	$ 7,429	$ 6,862	$ 7,429	$ 8,501
Loans 90 day past due and accruing		162		162
Total non-performing loans	6,862	7,591	6,862	7,591	8,501
Interest income that would have been recorded under original terms, non-accrual loans	144	124	300	220
Interest income that would have been recorded under original terms, 90 days past due and accruing		1		2
Interest income that would have been recorded under original terms	144	125	300	222
Interest income recorded during the period, 90 days past due and accruing		1		2
Interest income recorded during the period		1		2
Net impact on interest income, non-accrual loans	144	116	300	220
Net impact on interest income	144	116	300	220
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	1,815	1,772	1,815	1,772	1,770
Interest income that would have been recorded under original terms, non-accrual loans	21	17	42	36
Net impact on interest income, non-accrual loans	21	17	42	36
Commercial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	2,375	3,140	2,375	3,140	4,593
Interest income that would have been recorded under original terms, non-accrual loans	36	45	77	65
Net impact on interest income, non-accrual loans	36	45	77	65
Commercial Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	1,510	207	1,510	207	198
Interest income that would have been recorded under original terms, non-accrual loans	28	3	66	6
Net impact on interest income, non-accrual loans	28	3	66	6
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	447	1,524	447	1,524	1,242
Interest income that would have been recorded under original terms, non-accrual loans	46	47	91	88
Net impact on interest income, non-accrual loans	46	47	91	88
Consumer: Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	404	564	404	564	442
Interest income that would have been recorded under original terms, non-accrual loans	6	8	12	16
Net impact on interest income, non-accrual loans	6		12	16
Consumer: Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	311	222	311	222	$ 256
Interest income that would have been recorded under original terms, non-accrual loans	7	4	12	9
Net impact on interest income, non-accrual loans	$ 7	$ 4	$ 12	$ 9