Loans Receivable and Allowance for Loan Losses, Credit Quality Breakdown of Loan Portfolio by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	$ 689,712	$ 668,151	$ 650,964
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	677,846	651,261
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	4,981	6,687
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	6,885	10,203
Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	285,470	285,819	289,169
Residential Mortgage [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	281,529	279,040
Residential Mortgage [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	833	1,563
Residential Mortgage [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	3,108	5,216
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	43,180	37,356	37,485
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	43,156	37,312
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	24	44
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	234,830	235,129	223,167
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	229,305	227,573
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	3,682	4,615
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	1,843	2,941
ADC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	112,994	93,060	84,164
ADC [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	111,217	91,868
ADC [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	1,777	1,192
Home Equity/2nds [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	12,173	15,703	15,861
Home Equity/2nds [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	11,574	14,384
Home Equity/2nds [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	442	465
Home Equity/2nds [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	157	854
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	1,065	1,084	$ 1,118
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Net Amount	$ 1,065	$ 1,084