Fair Value Measurement - Summary of Carrying Amounts and Estimated Fair Values of the Bank's Financial Instruments (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Financial assets:
Cash and cash equivalents	$ 41,890,831	$ 41,876,399
Certificates of deposit with other banks	3,451,000	5,652,000
Investment securities available-for-sale	45,631,636	15,916,866
Other investments	190,700	714,000
Mortgage loans held for sale	2,844,707	2,944,962
Loans, net	266,304,448	262,355,967
Bank owned life insurance	11,166,573	10,883,428
Financial liabilities:
Deposits	289,316,708	294,099,827
FHLB advances	0	9,515,477
Reported Value Measurement [Member]
Financial assets:
Cash and cash equivalents	41,890,831	41,876,399
Certificates of deposit with other banks	3,451,000	5,652,000
Investment securities available-for-sale	45,631,636	15,916,866
Other investments	190,700	714,000
Mortgage loans held for sale	2,844,707	2,944,962
Loans, net	266,304,448	262,355,967
Bank owned life insurance	11,166,573	10,883,428
Financial liabilities:
Deposits	289,316,708	294,099,827
FHLB advances		9,515,477
Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and cash equivalents	41,890,831	41,876,399
Certificates of deposit with other banks	3,451,000	5,652,000
Investment securities available-for-sale	45,631,636	15,916,866
Other investments	190,700	714,000
Mortgage loans held for sale	2,844,707	2,944,962
Loans, net	274,168,000	277,366,000
Bank owned life insurance	11,166,573	10,883,428
Financial liabilities:
Deposits	289,267,454	313,033,000
FHLB advances		9,631,000
Estimate of Fair Value Measurement [Member] \| Level 1 [Member]
Financial assets:
Cash and cash equivalents	41,890,831	41,876,399
Certificates of deposit with other banks	3,451,000	5,652,000
Bank owned life insurance	11,166,573	10,883,428
Financial liabilities:
Deposits	216,786,454	207,523,546
Estimate of Fair Value Measurement [Member] \| Level 2 [Member]
Financial assets:
Investment securities available-for-sale	45,631,636	15,916,866
Other investments	190,700	714,000
Mortgage loans held for sale	2,844,707	2,944,962
Estimate of Fair Value Measurement [Member] \| Level 3 [Member]
Financial assets:
Loans, net	274,168,000	277,366,000
Financial liabilities:
Deposits	$ 72,481,000	105,509,454
FHLB advances		$ 9,631,000

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Certificates of deposit fair value disclosure.

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days.

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount of investments classified as other.

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