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Income Taxes (Details 1) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes    
Computed expense at statutory rates $ 2,731,384 $ 2,236,904
Tax exempt interest and BOLI (309,102) (306,073)
Disallowed interest 12,917 15,798
Partnership rehabilitation and tax credits (433,970) (415,099)
Low income housing investment amortization expense 265,982 246,564
Other (19,122) 11,766
Income tax expense $ 2,248,089 $ 1,789,860