Employee Benefit Plans - Schedule of Fair Values of the Bank's Pension Plan Assets (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets recorded at fair value on a recurring basis	$ 7,369,637	$ 9,587,893
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	13,488	14,881
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	2,410,250	3,059,854
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	4,945,899	6,513,158
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	7,369,637	9,587,893
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	13,488	14,881
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	2,410,250	3,059,854
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	$ 4,945,899	$ 6,513,158