Loans Receivable, Net - Schedule of Loans Accrual of Income has been Discontinued and Loans Past Due but Not Classified as Non-accrual (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Total non-accrual loans	$ 622,000	$ 234,000
Accruing loans delinquent 90 days or more
Total non-performing loans	622,000	234,000
Residential 1-4 Family Mortgage Loans [Member] | Mortgage Loans Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total non-accrual loans	256,000
Accruing loans delinquent 90 days or more
Commercial and Multi-Family Mortgage Loans [Member] | Mortgage Loans Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total non-accrual loans	243,000	234,000
Accruing loans delinquent 90 days or more
Home Equity Line of Credit [Member] | Mortgage Loans Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Total non-accrual loans
Accruing loans delinquent 90 days or more
Student Loans [Member]
Financing Receivable, Past Due [Line Items]
Total non-accrual loans	123,000
Accruing loans delinquent 90 days or more
Commercial and Other Loans [Member]
Financing Receivable, Past Due [Line Items]
Total non-accrual loans