Loans Receivable and Allowance for Loan Losses, Credit Quality Breakdown of Loan Portfolio by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	$ 669,912	$ 668,151
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	655,023	651,261
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	6,043	6,687
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	8,846	10,203
Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	285,023	284,646	$ 250,899
Residential Mortgage [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	278,721	277,867
Residential Mortgage [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	1,367	1,563
Residential Mortgage [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	4,935	5,216
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	39,015	37,356	48,554
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	38,981	37,312
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	34	44
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	230,336	236,302	190,961
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	224,274	228,746
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	4,185	4,615
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	1,877	2,941
ADC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	100,635	93,060	99,715
ADC [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	99,455	91,868
ADC [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	1,180	1,192
Home Equity/2nds[Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	13,853	15,703	$ 609,741
Home Equity/2nds[Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	12,542	14,384
Home Equity/2nds[Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	457	465
Home Equity/2nds[Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	854	854
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	1,050	1,084
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	$ 1,050	$ 1,084