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Regulatory Capital Requirements - Additional Information (Details) - USD ($)
Jan. 01, 2019
Jan. 01, 2016
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Regulatory Capital Requirements          
Movement of capital conservation buffer 2.50% 0.625%      
Percentage of bank's net worth of total assets     6.00%    
Bank's net worth of total assets     $ 24,449,538 $ 23,501,513  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment     $ 1,076,068 $ 1,190,650 $ 1,102,314
Percentage of net worth on assets     8.50% 7.90%