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Loans and Allowance for Loan Losses - Impaired loans (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Loans with a specific valuation allowance, Specific Allowance $ 28,735 $ 42,738
Recorded Balance 2,521,067 2,487,542
Unpaid Principal Balance 2,549,802 2,530,280
Average Investment in Impaired Loans 2,614,455 2,579,557
Interest Income Recognized 148,366 161,690
One- to Four- Family Mortgage Loans Owner Occupied [Member]    
Financing Receivable, Impaired [Line Items]    
Loans without a specific valuation allowance, Recorded Balance 1,054,515 966,592
Loans without a specific valuation allowance, Unpaid Principal Balance 1,054,515 966,592
Loans without a specific valuation allowance, Average Investment in Impaired Loans 1,077,076 975,511
Loans without a specific valuation allowance, Interest Income Recognized 52,394 33,914
Loans with a specific valuation allowance, Recorded Balance 61,058 0
Loans with a specific valuation allowance, Unpaid Principal Balance 81,780 0
Loans with a specific valuation allowance, Specific Allowance 20,722 0
Loans with a specific valuation allowance, Average Investment in Impaired Loans 79,941 0
Loans with a specific valuation allowance, Interest Income Recognized 1,170 0
One To Four Family Investment Mortgage Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Loans without a specific valuation allowance, Recorded Balance 374,389 315,393
Loans without a specific valuation allowance, Unpaid Principal Balance 374,389 315,393
Loans without a specific valuation allowance, Average Investment in Impaired Loans 383,268 322,564
Loans without a specific valuation allowance, Interest Income Recognized 21,191 39,833
Loans with a specific valuation allowance, Recorded Balance 386,344 384,237
Loans with a specific valuation allowance, Unpaid Principal Balance 394,357 417,920
Loans with a specific valuation allowance, Specific Allowance 8,013 33,683
Loans with a specific valuation allowance, Average Investment in Impaired Loans 401,718 427,874
Loans with a specific valuation allowance, Interest Income Recognized 19,965 22,775
Multi-Family Mortgage Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Loans without a specific valuation allowance, Recorded Balance 507,066 514,993
Loans without a specific valuation allowance, Unpaid Principal Balance 507,066 514,993
Loans without a specific valuation allowance, Average Investment in Impaired Loans 510,866 519,339
Loans without a specific valuation allowance, Interest Income Recognized 43,647 47,559
Loans with a specific valuation allowance, Recorded Balance 0 106,764
Loans with a specific valuation allowance, Unpaid Principal Balance 0 115,819
Loans with a specific valuation allowance, Specific Allowance 0 9,055
Loans with a specific valuation allowance, Average Investment in Impaired Loans 0 117,578
Loans with a specific valuation allowance, Interest Income Recognized 0 8,499
Nonresidential Mortgage Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Loans without a specific valuation allowance, Recorded Balance 56,190 151,096
Loans without a specific valuation allowance, Unpaid Principal Balance 56,190 151,096
Loans without a specific valuation allowance, Average Investment in Impaired Loans 75,260 165,871
Loans without a specific valuation allowance, Interest Income Recognized 4,583 5,996
Loans with a specific valuation allowance, Recorded Balance 0 0
Loans with a specific valuation allowance, Unpaid Principal Balance 0 0
Loans with a specific valuation allowance, Specific Allowance 0 0
Loans with a specific valuation allowance, Average Investment in Impaired Loans 0 0
Loans with a specific valuation allowance, Interest Income Recognized 0 0
Construction & Land Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Loans without a specific valuation allowance, Recorded Balance 0 0
Loans without a specific valuation allowance, Unpaid Principal Balance 0 0
Loans without a specific valuation allowance, Average Investment in Impaired Loans 0 0
Loans without a specific valuation allowance, Interest Income Recognized 0 0
Loans with a specific valuation allowance, Recorded Balance 0 0
Loans with a specific valuation allowance, Unpaid Principal Balance 0 0
Loans with a specific valuation allowance, Specific Allowance 0 0
Loans with a specific valuation allowance, Average Investment in Impaired Loans 0 0
Loans with a specific valuation allowance, Interest Income Recognized 0 0
Real Estate Secured Lines of Credit [Member]    
Financing Receivable, Impaired [Line Items]    
Loans without a specific valuation allowance, Recorded Balance 81,505 48,467
Loans without a specific valuation allowance, Unpaid Principal Balance 81,505 48,467
Loans without a specific valuation allowance, Average Investment in Impaired Loans 86,326 50,820
Loans without a specific valuation allowance, Interest Income Recognized 5,416 3,114
Loans with a specific valuation allowance, Recorded Balance 0 0
Loans with a specific valuation allowance, Unpaid Principal Balance 0 0
Loans with a specific valuation allowance, Specific Allowance 0 0
Loans with a specific valuation allowance, Average Investment in Impaired Loans 0 0
Loans with a specific valuation allowance, Interest Income Recognized 0 0
Commercial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Loans without a specific valuation allowance, Recorded Balance 0 0
Loans without a specific valuation allowance, Unpaid Principal Balance 0 0
Loans without a specific valuation allowance, Average Investment in Impaired Loans 0 0
Loans without a specific valuation allowance, Interest Income Recognized 0 0
Loans with a specific valuation allowance, Recorded Balance 0 0
Loans with a specific valuation allowance, Unpaid Principal Balance 0 0
Loans with a specific valuation allowance, Specific Allowance 0 0
Loans with a specific valuation allowance, Average Investment in Impaired Loans 0 0
Loans with a specific valuation allowance, Interest Income Recognized 0 0
Other Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Loans without a specific valuation allowance, Recorded Balance 0 0
Loans without a specific valuation allowance, Unpaid Principal Balance 0 0
Loans without a specific valuation allowance, Average Investment in Impaired Loans 0 0
Loans without a specific valuation allowance, Interest Income Recognized 0 0
Loans with a specific valuation allowance, Recorded Balance 0 0
Loans with a specific valuation allowance, Unpaid Principal Balance 0 0
Loans with a specific valuation allowance, Specific Allowance 0 0
Loans with a specific valuation allowance, Average Investment in Impaired Loans 0 0
Loans with a specific valuation allowance, Interest Income Recognized $ 0 $ 0