Loans (Information on Non-Accrual Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 7,072	$ 6,471	$ 7,072	$ 6,471	$ 5,546
Loans 90 day past due and accruing					233
Total non-performing loans	7,072	6,471	7,072	6,471	5,779
Interest income that would have been recorded under original terms, non-accrual loans	117	110	257	340
Interest income that would have been recorded under original terms	117	110	257	340
Net impact on interest income, non-accrual loans	117	110	257	340
Net impact on interest income	117	110	257	340
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	1,337	1,005	1,337	1,005	905
Interest income that would have been recorded under original terms, non-accrual loans	13	9	36	52
Net impact on interest income, non-accrual loans	13	9	36	52
Commercial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	698	1,561	698	1,561	1,307
Interest income that would have been recorded under original terms, non-accrual loans	16	30	43	88
Net impact on interest income, non-accrual loans	16	30	43	88
Commercial Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	3,203	2,624	3,203	2,624	2,300
Interest income that would have been recorded under original terms, non-accrual loans	56	50	121	140
Net impact on interest income, non-accrual loans	56	50	121	140
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	1,558	479	1,558	479	476
Interest income that would have been recorded under original terms, non-accrual loans	27	9	40	29
Net impact on interest income, non-accrual loans	27	9	40	29
Consumer: Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	143	631	143	631	391
Interest income that would have been recorded under original terms, non-accrual loans	2	9	8	17
Net impact on interest income, non-accrual loans	2	9	8	17
Consumer: Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	133	171	133	171	$ 167
Interest income that would have been recorded under original terms, non-accrual loans	3	3	9	14
Net impact on interest income, non-accrual loans	$ 3	$ 3	$ 9	$ 14