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Loans Receivable, Net (Impaired Financing Receivables) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, related allowance $ 0 $ 0 $ 738,662
Impaired financing receivable, recorded investment 2,219,330 3,229,883 9,364,125
Impaired financing receivable, unpaid principal balance 3,268,049 4,305,403 11,299,728
Impaired financing receivable, average recorded investment 3,864,751 6,394,612 11,026,748
Impaired financing receivable, interest income, accrual method 82,925 54,372 328,920
Residential Real Estate      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, recorded investment 1,284,303 1,086,433 1,700,861
Impaired financing receivable, with no related allowance, unpaid principal balance 1,284,303 1,086,433 1,700,861
Impaired financing receivable, with no related allowance, average recorded investment 1,877,590 1,322,609 1,743,906
Impaired financing receivable, with no related allowance, interest income, accrual method 24,597 0 31,853
Impaired financing receivable, related allowance     0
Impaired financing receivable, recorded investment     1,700,861
Impaired financing receivable, unpaid principal balance     1,700,861
Impaired financing receivable, average recorded investment     1,743,906
Impaired financing receivable, interest income, accrual method     31,853
Consumer Loans      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, recorded investment 161,869 184,402 986,380
Impaired financing receivable, with no related allowance, unpaid principal balance 170,169 192,702 994,680
Impaired financing receivable, with no related allowance, average recorded investment 210,722 1,106,795 502,479
Impaired financing receivable, with no related allowance, interest income, accrual method 1,591 0 0
Impaired financing receivable, related allowance     73,662
Impaired financing receivable, recorded investment     1,060,042
Impaired financing receivable, unpaid principal balance     1,068,342
Impaired financing receivable, average recorded investment     508,618
Impaired financing receivable, interest income, accrual method     0
Commercial Business      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, recorded investment 53,047 64,406 77,206
Impaired financing receivable, with no related allowance, unpaid principal balance 948,046 959,406 972,206
Impaired financing receivable, with no related allowance, average recorded investment 58,597 71,422 85,020
Impaired financing receivable, with no related allowance, interest income, accrual method 0 0 0
Impaired financing receivable, related allowance     0
Impaired financing receivable, recorded investment     77,206
Impaired financing receivable, unpaid principal balance     972,206
Impaired financing receivable, average recorded investment     85,020
Impaired financing receivable, interest income, accrual method     0
Commercial Real Estate      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, recorded investment 720,111 1,894,642 5,084,458
Impaired financing receivable, with no related allowance, unpaid principal balance 865,531 2,066,862 6,116,761
Impaired financing receivable, with no related allowance, average recorded investment 1,717,842 3,893,786 8,052,817
Impaired financing receivable, with no related allowance, interest income, accrual method $ 56,737 $ 54,372 212,186
Impaired financing receivable, related allowance     665,000
Impaired financing receivable, recorded investment     6,526,016
Impaired financing receivable, unpaid principal balance     7,558,319
Impaired financing receivable, average recorded investment     8,689,204
Impaired financing receivable, interest income, accrual method     $ 297,067