Loans Receivable and the Allowance for Loan Losses - Nonaccrual status (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	$ 89,000	$ 398,000
Current	78,395,000	80,290,000
Total Loans Receivable	78,484,000	80,688,000
Loan balances outstanding on non-accrual status	0	0
Mortgage - 1-4 Family
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	89,000	398,000
Current	73,502,000	74,787,000
Total Loans Receivable	73,591,000	75,185,000
Mortgage - Multifamily
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	3,567,000	4,117,000
Total Loans Receivable	3,567,000	4,117,000
Mortgage - Commercial real estate
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	1,117,000	1,175,000
Total Loans Receivable	1,117,000	1,175,000
Consumer Loans
Financing Receivable, Recorded Investment, Aging [Abstract]
Current	209,000	211,000
Total Loans Receivable	209,000	211,000
30-59 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		227,000
30-59 Days Past Due | Mortgage - 1-4 Family
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		227,000
60-89 Days Past Due
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	89,000	171,000
60-89 Days Past Due | Mortgage - 1-4 Family
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	$ 89,000	$ 171,000