Allowance for Loan Losses (Summary of Activity in Allowance for Loan Losses) (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2020		Sep. 30, 2019	Sep. 30, 2020		Sep. 30, 2019	Dec. 31, 2019
Allowance for Loan Losses [Line Items]
Balance, beginning		$ 5,064		$ 3,863	$ 4,267		$ 3,448
Charge-offs		(23)		(25)	(64)		(50)
Recoveries		6		3	19		18
Provision (credit)		300		300	1,125		725
Balance, ending		5,347		4,141	5,347		4,141
Allowance for loan losses: Ending balance: collectively evaluated for impairment		5,347			5,347			$ 4,267
Ending balance: Gross Loans Receivable		493,323	[1]		493,323	[1]		471,535	[2]
Loans Receivable: Ending balance: individually evaluated for impairment		319	[1]		319	[1]		166	[2]
Loans Receivable: Ending balance: collectively evaluated for impairment		493,004	[1]		493,004	[1]		471,369	[2]
Deferred loan costs		3,292			3,292			3,548
Real Estate Loans Including One-To Four-Family Construction Loans [Member]
Allowance for Loan Losses [Line Items]
Balance, beginning	[3]	426		389	436		471
Charge-offs	[3]			(2)	(26)		(2)
Recoveries	[3]						8
Provision (credit)	[3]	(23)		(4)	(7)		(94)
Balance, ending	[3]	403		383	403		383
Allowance for loan losses: Ending balance: collectively evaluated for impairment	[3]	403			403			436
Ending balance: Gross Loans Receivable	[3]	151,356	[1]		151,356	[1]		154,749	[2]
Loans Receivable: Ending balance: individually evaluated for impairment	[3]	304	[1]		304	[1]		166	[2]
Loans Receivable: Ending balance: collectively evaluated for impairment	[3]	151,052	[1]		151,052	[1]		154,583	[2]
Real Estate Loans: Home Equity [Member]
Allowance for Loan Losses [Line Items]
Balance, beginning		169		144	129		91
Charge-offs		(6)			(6)		(4)
Recoveries					1		1
Provision (credit)				(9)	39		47
Balance, ending		163		135	163		135
Allowance for loan losses: Ending balance: collectively evaluated for impairment		163			163			129
Ending balance: Gross Loans Receivable		47,073	[1]		47,073	[1]		45,250	[2]
Loans Receivable: Ending balance: individually evaluated for impairment	[1]	15			15
Loans Receivable: Ending balance: collectively evaluated for impairment		47,058	[1]		47,058	[1]		45,250	[2]
Real Estate Loans: Commercial [Member]
Allowance for Loan Losses [Line Items]
Balance, beginning		3,377		2,777	2,682		2,020
Charge-offs				(10)			(10)
Recoveries				1	1		3
Provision (credit)		67		122	761		877
Balance, ending		3,444		2,890	3,444		2,890
Allowance for loan losses: Ending balance: collectively evaluated for impairment		3,444			3,444			2,682
Ending balance: Gross Loans Receivable		216,571	[1],[4]		216,571	[1],[4]		211,220	[2]
Loans Receivable: Ending balance: collectively evaluated for impairment		216,571	[1]		216,571	[1]		211,220	[2]
Real Estate Loans: Construction - Commercial [Member]
Allowance for Loan Losses [Line Items]
Balance, beginning		554		379	388		250
Provision (credit)		6		60	172		189
Balance, ending		560		439	560		439
Allowance for loan losses: Ending balance: collectively evaluated for impairment		560			560			388
Ending balance: Gross Loans Receivable		37,338	[1]		37,338	[1]		32,299	[2]
Loans Receivable: Ending balance: collectively evaluated for impairment		37,338	[1]		37,338	[1]		32,299	[2]
Other Loans: Commercial [Member]
Allowance for Loan Losses [Line Items]
Balance, beginning		481		133	478		507
Charge-offs					(5)
Recoveries					4
Provision (credit)		179		104	183		(270)
Balance, ending		660		237	660		237
Allowance for loan losses: Ending balance: collectively evaluated for impairment		660			660			478
Ending balance: Gross Loans Receivable		39,673	[1],[5],[6]		39,673	[1],[5],[6]		26,720	[2]
Loans Receivable: Ending balance: collectively evaluated for impairment		39,673	[1]		39,673	[1]		26,720	[2]
Other Loans: Consumer [Member]
Allowance for Loan Losses [Line Items]
Balance, beginning		34		30	26		25
Charge-offs		(17)		(13)	(27)		(34)
Recoveries		6		2	13		6
Provision (credit)		1		7	12		29
Balance, ending		24		26	24		26
Allowance for loan losses: Ending balance: collectively evaluated for impairment		24			24			26
Ending balance: Gross Loans Receivable		1,312	[1]		1,312	[1]		1,297	[2]
Loans Receivable: Ending balance: collectively evaluated for impairment		1,312	[1]		1,312	[1]		1,297	[2]
Unallocated Financing Receivables [Member]
Allowance for Loan Losses [Line Items]
Balance, beginning		23		11	128		84
Charge-offs
Recoveries
Provision (credit)		70		20	(35)		(53)
Balance, ending		93		$ 31	93		$ 31
Allowance for loan losses: Ending balance: individually evaluated for impairment
Allowance for loan losses: Ending balance: collectively evaluated for impairment		93			93			$ 128
Ending balance: Gross Loans Receivable	[1]
Loans Receivable: Ending balance: individually evaluated for impairment	[1]
Loans Receivable: Ending balance: collectively evaluated for impairment	[1]

[1] Gross Loans Receivable does not include allowance for loan losses of $(5,347) or deferred loan costs of $3,292.

[2] Gross Loans Receivable does not include allowance for loan losses of $(4,267) or deferred loan costs of $3,548.

[3] Includes one- to four-family construction loans.

[4] The increase in commercial real estate loans classified as "Special Mention" was primarily due to a $13.3 million loan relationship with one borrower that is well collateralized and supported by guarantors.

[5] Includes $18.6 million of PPP loans which are 100% guaranteed by SBA and are graded as Pass/Performing loans.

[6] Includes $18.6 million of PPP loans which do not require payments for a certain amount of time under the CARES Act and are 100% guaranteed by SBA