Loans Receivable, Part II (Details) - USD ($)		Dec. 31, 2020	Dec. 31, 2019
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		$ 7,896,000	$ 6,465,000
Current	[1]	1,367,241,000	1,381,566,000
Total Loans		1,375,137,000	1,388,031,000
Loan Receivable, Nonaccrual Status		1,600,000	2,000,000.0
1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	3,796,000	1,185,000
Loan Receivable, 1 to 59 Days Past Due, Nonaccrual Status		611,000	53,000
60 to 89 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[3]	142,000	648,000
Loan Receivable, 60 to 89 Days Past Due, Nonaccrual Status		0	291,000
Greater than 90 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		3,958,000	4,632,000
90 or more days past due		586,000,000	0
Residential Real Estate [Member] | One-to-Four Family [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		7,468,000	5,786,000
Current	[1]	419,324,000	474,494,000
Total Loans		426,792,000	480,280,000
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]	3,796,000	1,179,000
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]	142,000	638,000
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		3,530,000	3,969,000
Residential Real Estate [Member] | Multi Family [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		314,000	360,000
Current	[1]	571,634,000	584,499,000
Total Loans		571,948,000	584,859,000
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	360,000
Residential Real Estate [Member] | Home Equity [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		30,000	10,000
Current	[1]	14,790,000	18,061,000
Total Loans		14,820,000	18,071,000
Residential Real Estate [Member] | Home Equity [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	0	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	10,000
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	0
Construction and Land [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		43,000	0
Current	[1]	77,037,000	37,033,000
Total Loans		77,080,000	37,033,000
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	0
Commercial Real Estate [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		41,000	303,000
Current	[1]	238,334,000	236,400,000
Total Loans		238,375,000	236,703,000
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		41,000	303,000
Consumer [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due		0	0
Current	[1]	736,000	832,000
Total Loans		736,000	832,000
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		0	6,000
Current	[1]	45,386,000	30,247,000
Total Loans		45,386,000	30,253,000
Commercial Loans [Member] | 1 to 59 Days Past Due [Member]
Financing receivable, recorded investment, aging [Abstract]
Total Past Due	[2]	0	6,000
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 $1.6 million and $2.0 million for December 31, 2020 and 2019, respectively, which are on non-accrual status.

[2] Includes $611,000 and $53,000 for December 31, 2020 and 2019, respectively, which are on non-accrual status.

[3] Includes $- and $291,000 for December 31, 2020 and 2019, respectively, which are on non-accrual status.