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Investment securities - Schedule of Investment Securities (Detail) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Amortized cost $ 8,696,093  
Estimated fair value 8,635,077  
Investment Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 8,696,093 $ 8,692,637
Gross unrealized gains 0 14,207
Gross unrealized losses (61,016) 0
Estimated fair value 8,635,077 8,706,844
Federal agency bonds — mortgage-backed    
Debt Securities, Available-for-sale [Line Items]    
Amortized cost 8,696,093 8,692,637
Gross unrealized gains 0 14,207
Gross unrealized losses (61,016) 0
Estimated fair value $ 8,635,077 $ 8,706,844