Allowance for Loan Losses (Analysis of Past Due Loans and Non-Accruing Loans) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020		Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total Past Due		$ 3,590		$ 5,897
Current Due		489,733		465,638
Total Loans Receivable		493,323	[1]	471,535	[2]
Loans on Non-Accrual		3,361		3,437
Real Estate Loans: One-to-Four Family [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	[3]	2,448		3,841
Current Due	[3]	148,908		150,908
Total Loans Receivable	[3]	151,356		154,749
Loans on Non-Accrual	[3]	2,664		2,845
Real Estate Loans: Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		875		913
Current Due		46,198		44,337
Total Loans Receivable		47,073	[1]	45,250	[2]
Loans on Non-Accrual		696		590
Real Estate Loans: Commercial [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		253		1,133
Current Due		216,318		210,087
Total Loans Receivable		216,571	[1],[4]	211,220	[2]
Real Estate Loans: Construction - Commercial [Member]
Financing Receivable, Past Due [Line Items]
Current Due		37,338		32,299
Total Loans Receivable		37,338	[1]	32,299	[2]
Other Loans: Commercial [Member]
Financing Receivable, Past Due [Line Items]
Current Due		39,673	[5]	26,720
Total Loans Receivable		39,673	[1],[5],[6]	26,720	[2]
PPP loans outstanding		$ 18,600
PPP loans guaranteed by SBA, percent		100.00%
Other Loans: Consumer [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		$ 14		10
Current Due		1,298		1,287
Total Loans Receivable		1,312	[1]	1,297	[2]
Loans on Non-Accrual		1		2
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		1,157		1,421
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Loans: One-to-Four Family [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	[3]	1,000		1,245
Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Loans: Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		144		168
Financial Asset, 30 to 59 Days Past Due [Member] | Other Loans: Consumer [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		13		8
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		303		1,967
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Loans: One-to-Four Family [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	[3]	203		672
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Loans: Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		100		162
Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Loans: Commercial [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due				1,133
Financing Receivables, 90 Days or More Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		2,130		2,509
Financing Receivables, 90 Days or More Past Due [Member] | Real Estate Loans: One-to-Four Family [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due	[3]	1,245		1,924
Financing Receivables, 90 Days or More Past Due [Member] | Real Estate Loans: Home Equity [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		631		583
Financing Receivables, 90 Days or More Past Due [Member] | Real Estate Loans: Commercial [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		253
Financing Receivables, 90 Days or More Past Due [Member] | Other Loans: Consumer [Member]
Financing Receivable, Past Due [Line Items]
Total Past Due		$ 1		$ 2

[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 do not require payments for a certain amount of time under the CARES Act and are 100% guaranteed by SBA

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