Loans Receivable and Allowance for Loan Losses, Credit Quality Breakdown of Loan Portfolio by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	$ 638,659	$ 648,432	$ 677,115
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	633,252	638,135
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	3,923	4,437
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	1,484	5,860
Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	260,981	269,654	270,979
Residential Mortgage [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	260,609	265,510
Residential Mortgage [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	372	4,144
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	43,490	43,127	44,725
Commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	42,290	41,927
Commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	1,200	1,200
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	220,654	229,257	238,618
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	217,509	225,363
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	2,331	2,835
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	814	1,059
ADC [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	99,861	92,822	108,933
ADC [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	99,563	92,304
ADC [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	298	518
Home Equity/2nds [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	12,199	12,031	12,714
Home Equity/2nds [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	11,807	11,490
Home Equity/2nds [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	392	402
Home Equity/2nds [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable		139
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	1,474	1,541	$ 1,146
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	$ 1,474	$ 1,541