Loans and Allowance for Loan Losses - Nonaccrual loans (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 110,934	$ 744,381
One- to Four- Family Mortgage Loans Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	110,934	676,024
One To Four Family Investment Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Multi-Family Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Nonresidential Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	67,829
Construction & Land Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Real Estate Secured Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	0	0
Other Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans	$ 0	$ 528