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 |