Employee Benefit Plans - Schedule of Fair Values of the Bank's Pension Plan Assets (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets recorded at fair value on a recurring basis	$ 9,587,893	$ 9,168,583
Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets recorded at fair value on a recurring basis	14,881	23,438
Debt Securities Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets recorded at fair value on a recurring basis	3,059,854	2,751,130
Equity Securities Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets recorded at fair value on a recurring basis	6,513,158	6,394,015
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets recorded at fair value on a recurring basis	9,587,893	9,168,583
Level 1 [Member] | Cash and Cash Equivalents [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets recorded at fair value on a recurring basis	14,881	23,438
Level 1 [Member] | Debt Securities Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets recorded at fair value on a recurring basis	3,059,854	2,751,130
Level 1 [Member] | Equity Securities Mutual Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets recorded at fair value on a recurring basis	$ 6,513,158	$ 6,394,015