Loans Receivable, Part II (Details) - USD ($)		Mar. 31, 2021	Dec. 31, 2020
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		$ 6,922,000	$ 7,896,000
Current	[1]	1,328,501,000	1,367,241,000
Total Loans		1,335,423,000	1,375,137,000
Loan Receivable, Nonaccrual Status		1,200,000	1,600,000
1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	4,346,000	3,796,000
Loan Receivable, Nonaccrual Status		394,000	611,000
60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	142,000
Loan Receivable, Nonaccrual Status		0	0
Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		2,576,000	3,958,000
90 or more days past due		0	586,000
Residential Real Estate [Member] | One-to-Four Family [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		6,329,000	7,468,000
Current	[1]	394,841,000	419,324,000
Total Loans		401,170,000	426,792,000
Residential Real Estate [Member] | One-to-Four Family [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	4,170,000	3,796,000
Residential Real Estate [Member] | One-to-Four Family [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	142,000
Residential Real Estate [Member] | One-to-Four Family [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		2,159,000	3,530,000
Residential Real Estate [Member] | Multi Family [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		314,000	314,000
Current	[1]	571,851,000	571,634,000
Total Loans		572,165,000	571,948,000
Residential Real Estate [Member] | Multi Family [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	0	0
Residential Real Estate [Member] | Multi Family [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	0
Residential Real Estate [Member] | Multi Family [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		314,000	314,000
Residential Real Estate [Member] | Home Equity [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		66,000	30,000
Current	[1]	14,607,000	14,790,000
Total Loans		14,673,000	14,820,000
Residential Real Estate [Member] | Home Equity [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	36,000	0
Residential Real Estate [Member] | Home Equity [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	0
Residential Real Estate [Member] | Home Equity [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		30,000	30,000
Construction and Land [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		43,000	43,000
Current	[1]	57,080,000	77,037,000
Total Loans		57,123,000	77,080,000
Construction and Land [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	0	0
Construction and Land [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	0
Construction and Land [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		43,000	43,000
Commercial Real Estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		30,000	41,000
Current	[1]	241,760,000	238,334,000
Total Loans		241,790,000	238,375,000
Commercial Real Estate [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	0	0
Commercial Real Estate [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	0
Commercial Real Estate [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		30,000	41,000
Consumer [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		0	0
Current	[1]	698,000	736,000
Total Loans		698,000	736,000
Consumer [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	0	0
Consumer [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	0
Consumer [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		0	0
Commercial Loans [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		140,000	0
Current	[1]	47,664,000	45,386,000
Total Loans		47,804,000	45,386,000
Commercial Loans [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	140,000	0
Commercial Loans [Member] | 60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	0	0
Commercial Loans [Member] | Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		$ 0	$ 0

[1] Includes $1.2 million and $1.6 million at March 31, 2021 and December 31, 2020, respectively, which are on non-accrual status.

[2]  Includes $394,000 and $611,000 at March 31, 2021 and December 31, 2020, respectively, which are on non-accrual status.

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