Loans (Information on Non-Accrual Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 5,923	$ 6,721	$ 5,923	$ 6,721	$ 5,546
Loans 90 day past due and accruing	205	23	205	23	233
Total non-performing loans	6,128	6,744	6,128	6,744	5,779
Interest income that would have been recorded under original terms, non-accrual loans	49	107	140	230
Interest income that would have been recorded under original terms, 90 days past due and accruing	3	1	3	1
Interest income that would have been recorded under original terms	52	108	143	231
Interest income recorded during the period, 90 days past due and accruing	3	1	3	1
Interest income recorded during the period	3	1	3	1
Net impact on interest income, non-accrual loans	49	107	140	230
Net impact on interest income	49	107	140	230
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	779	1,344	779	1,344	905
Loans 90 day past due and accruing	142		142
Interest income that would have been recorded under original terms, non-accrual loans	11	18	23	43
Net impact on interest income, non-accrual loans	11	18	23	43
Commercial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	563	1,593	563	1,593	1,307
Interest income that would have been recorded under original terms, non-accrual loans	1	28	27	58
Net impact on interest income, non-accrual loans	1	28	27	58
Commercial Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	2,026	2,583	2,026	2,583	2,300
Interest income that would have been recorded under original terms, non-accrual loans	22	46	65	90
Net impact on interest income, non-accrual loans	22	46	65	90
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	2,274	488	2,274	488	476
Interest income that would have been recorded under original terms, non-accrual loans	13	9	13	20
Net impact on interest income, non-accrual loans	13	9	13	20
Consumer: Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	143	498	143	498	391
Interest income that would have been recorded under original terms, non-accrual loans	(1)	3	6	8
Net impact on interest income, non-accrual loans	(1)	3	6	8
Consumer: Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	138	215	138	215	$ 167
Interest income that would have been recorded under original terms, non-accrual loans	3	3	6	11
Net impact on interest income, non-accrual loans	$ 3	$ 3	$ 6	$ 11