Loans (Information on Non-Accrual Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 4,594	$ 8,408	$ 5,546
Loans 90 day past due and accruing			233
Total non-performing loans	4,594	8,408	5,779
Interest income that would have been recorded under original terms, non-accrual loans	91	123
Interest income that would have been recorded under original terms	91	123
Net impact on interest income, non-accrual loans	91	123
Net impact on interest income	91	123
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	792	2,033	905
Interest income that would have been recorded under original terms, non-accrual loans	12	25
Net impact on interest income, non-accrual loans	12	25
Commercial Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	1,221	2,088	1,307
Interest income that would have been recorded under original terms, non-accrual loans	26	30
Net impact on interest income, non-accrual loans	26	30
Commercial Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	2,045	3,015	2,300
Interest income that would have been recorded under original terms, non-accrual loans	43	44
Net impact on interest income, non-accrual loans	43	44
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans		497	476
Interest income that would have been recorded under original terms, non-accrual loans		11
Net impact on interest income, non-accrual loans		11
Consumer: Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	391	464	391
Interest income that would have been recorded under original terms, non-accrual loans	7	5
Net impact on interest income, non-accrual loans	7	5
Consumer: Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	145	311	$ 167
Interest income that would have been recorded under original terms, non-accrual loans	3	8
Net impact on interest income, non-accrual loans	$ 3	$ 8