Loans Receivable, Part II (Details) - USD ($)		Sep. 30, 2021	Dec. 31, 2020
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		$ 1,226,834,000	$ 1,375,137,000
Loan Receivable, Nonaccrual Status		594,000	1,600,000
Total Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		11,232,000	7,896,000
1 to 59 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[1]	6,429,000	3,796,000
Loan Receivable, Nonaccrual Status		0	611,000
60 to 89 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[2]	1,425,000	142,000
Loan Receivable, Nonaccrual Status		0	0
Greater than 90 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		3,378,000	3,958,000
90 or more days past due		0	586,000
Current [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[3]	1,215,602,000	1,367,241,000
Residential Real Estate [Member] | One-to-Four Family [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		331,570,000	426,792,000
Residential Real Estate [Member] | One-to-Four Family [Member] | Total Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		5,798,000	7,468,000
Residential Real Estate [Member] | One-to-Four Family [Member] | 1 to 59 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[1]	1,152,000	3,796,000
Residential Real Estate [Member] | One-to-Four Family [Member] | 60 to 89 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[2]	1,425,000	142,000
Residential Real Estate [Member] | One-to-Four Family [Member] | Greater than 90 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		3,221,000	3,530,000
Residential Real Estate [Member] | One-to-Four Family [Member] | Current [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[3]	325,772,000	419,324,000
Residential Real Estate [Member] | Multi Family [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		547,435,000	571,948,000
Residential Real Estate [Member] | Multi Family [Member] | Total Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		5,327,000	314,000
Residential Real Estate [Member] | Multi Family [Member] | 1 to 59 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[1]	5,198,000	0
Residential Real Estate [Member] | Multi Family [Member] | 60 to 89 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[2]	0	0
Residential Real Estate [Member] | Multi Family [Member] | Greater than 90 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		129,000	314,000
Residential Real Estate [Member] | Multi Family [Member] | Current [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[3]	542,108,000	571,634,000
Residential Real Estate [Member] | Home Equity [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		12,024,000	14,820,000
Residential Real Estate [Member] | Home Equity [Member] | Total Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		107,000	30,000
Residential Real Estate [Member] | Home Equity [Member] | 1 to 59 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[1]	79,000	0
Residential Real Estate [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[2]	0	0
Residential Real Estate [Member] | Home Equity [Member] | Greater than 90 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		28,000	30,000
Residential Real Estate [Member] | Home Equity [Member] | Current [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[3]	11,917,000	14,790,000
Construction and Land [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		69,076,000	77,080,000
Construction and Land [Member] | Total Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		0	43,000
Construction and Land [Member] | 1 to 59 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[1]	0	0
Construction and Land [Member] | 60 to 89 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[2]	0	0
Construction and Land [Member] | Greater than 90 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		0	43,000
Construction and Land [Member] | Current [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[3]	69,076,000	77,037,000
Commercial Real Estate [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		241,929,000	238,375,000
Commercial Real Estate [Member] | Total Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		0	41,000
Commercial Real Estate [Member] | 1 to 59 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[1]	0	0
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[2]	0	0
Commercial Real Estate [Member] | Greater than 90 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		0	41,000
Commercial Real Estate [Member] | Current [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[3]	241,929,000	238,334,000
Consumer [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		709,000	736,000
Consumer [Member] | Total Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		0	0
Consumer [Member] | 1 to 59 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[1]	0	0
Consumer [Member] | 60 to 89 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[2]	0	0
Consumer [Member] | Greater than 90 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		0	0
Consumer [Member] | Current [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[3]	709,000	736,000
Commercial Loans [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		24,091,000	45,386,000
Commercial Loans [Member] | Total Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		0	0
Commercial Loans [Member] | 1 to 59 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[1]	0	0
Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[2]	0	0
Commercial Loans [Member] | Greater than 90 Days Past Due [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans		0	0
Commercial Loans [Member] | Current [Member]
Analysis of Past Due Loans Receivable [Abstract]
Total Loans	[3]	$ 24,091,000	$ 45,386,000

[1]  Includes $- and $611,000 at September 30, 2021 and December 31, 2020, respectively, which are on non-accrual status.

[2] Includes $- and $- at September 30, 2021 and December 31, 2020, respectively, which are on non-accrual status.

[3] Includes $594,000 and $1.6 million at September 30, 2021 and December 31, 2020, respectively, which are on non-accrual status.