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Loans Receivable, Net (Impaired Financing Receivables) (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, related allowance $ 0 $ 0 $ 0
Impaired financing receivable, recorded investment 2,323,307 2,219,330 3,229,883
Impaired financing receivable, unpaid principal balance 3,372,027 3,268,049 4,305,403
Impaired financing receivable, average recorded investment 2,572,276 3,900,000 6,394,612
Impaired financing receivable, interest income, accrual method 22,199 82,925 54,372
Residential Real Estate      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, recorded investment 1,128,452 1,284,303 1,086,433
Impaired financing receivable, with no related allowance, unpaid principal balance 1,128,452 1,284,303 1,086,433
Impaired financing receivable, with no related allowance, average recorded investment 1,275,540 1,877,590 1,322,609
Impaired financing receivable, with no related allowance, interest income, accrual method 4,139 24,597 0
Consumer Loans      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, recorded investment 97,302 161,869 184,402
Impaired financing receivable, with no related allowance, unpaid principal balance 105,602 170,169 192,702
Impaired financing receivable, with no related allowance, average recorded investment 142,602 210,722 1,106,795
Impaired financing receivable, with no related allowance, interest income, accrual method 0 1,591 0
Commercial Business      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, recorded investment 31,446 53,047 64,406
Impaired financing receivable, with no related allowance, unpaid principal balance 926,446 948,046 959,406
Impaired financing receivable, with no related allowance, average recorded investment 46,093 58,597 71,422
Impaired financing receivable, with no related allowance, interest income, accrual method 0 0 0
Commercial Real Estate      
Financing Receivable, Impaired [Line Items]      
Impaired financing receivable, with no related allowance, recorded investment 1,066,107 720,111 1,894,642
Impaired financing receivable, with no related allowance, unpaid principal balance 1,211,527 865,531 2,066,862
Impaired financing receivable, with no related allowance, average recorded investment 1,108,041 1,717,842 3,893,786
Impaired financing receivable, with no related allowance, interest income, accrual method $ 18,060 $ 56,737 $ 54,372