Loans Receivable and Allowance for Loan Losses (Composition of the Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 928,597	$ 924,676
Deferred fees, net	(32)	(95)
Total loans receivable	928,565	924,581
Allowance for loan losses	(9,088)	(8,509)	$ (8,349)	$ (8,452)
Net loans receivable	$ 919,477	$ 916,072
Percent of Loans	100.00%	100.00%
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 227,373	$ 229,781
Allowance for loan losses	$ (1,644)	$ (1,552)	(1,455)	(1,328)
Percent of Loans	24.50%	24.90%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 398,492	$ 391,327
Allowance for loan losses	$ (4,915)	$ (4,687)	(4,947)	(5,455)
Percent of Loans	42.90%	42.30%
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 16,622	$ 17,732
Allowance for loan losses	$ (87)	$ (95)	(108)	(93)
Percent of Loans	1.80%	1.90%
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 132,716	$ 134,150
Allowance for loan losses	$ (1,064)	$ (949)	(811)	(712)
Percent of Loans	14.30%	14.50%
Consumer Loans To Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 153,394	$ 151,686
Allowance for loan losses	$ (1,378)	$ (1,226)	$ (1,028)	$ (864)
Percent of Loans	16.50%	16.40%