Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets
Securities held-to-maturity	$ 51,013	$ 9,225
Loans held for sale	862	1,378
Bank-owned life insurance	23,873	21,416
Carrying Value [Member]
Financial assets
Cash and cash equivalents	283,621	181,652
Securities held-to-maturity	51,317	9,045
Restricted stock	4,614	4,614
Loans held for sale	862	1,378
Net loans	538,450	600,885
Bank-owned life insurance	23,873	21,416
Accrued interest receivable	1,768	2,159
Financial liabilities
Deposits	968,629	891,562
Short-term borrowings	38,130	37,215
Other borrowings	3,489	4,664
Accrued interest payable	59	90
Carrying Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	584	488
Fair Value [Member]
Financial assets
Cash and cash equivalents	283,621	181,652
Securities held-to-maturity	51,013	9,225
Loans held for sale	862	1,378
Net loans	543,274	598,583
Bank-owned life insurance	23,873	21,416
Accrued interest receivable	1,768	2,159
Financial liabilities
Deposits	968,964	892,357
Short-term borrowings	38,130	37,215
Other borrowings	3,550	4,775
Accrued interest payable	59	90
Fair Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	584	488
Fair Value [Member] \| Level I [Member]
Financial assets
Cash and cash equivalents	283,621	181,652
Loans held for sale	862	1,378
Bank-owned life insurance	23,873	21,416
Accrued interest receivable	1,768	2,159
Financial liabilities
Deposits	844,036	768,230
Short-term borrowings	38,130	37,215
Accrued interest payable	59	90
Fair Value [Member] \| Level II [Member]
Financial assets
Securities held-to-maturity	51,013	9,225
Fair Value [Member] \| Level III [Member]
Financial assets
Net loans	543,274	598,583
Financial liabilities
Deposits	124,928	124,127
Other borrowings	3,550	4,775
Fair Value [Member] \| Level III [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	$ 584	$ 488

Accrued interest payable fair value disclosure.

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- Definition

Accrued interest receivable fair value disclosure.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10))
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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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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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No definition available.

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

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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- Definition

The aggregate value of all restricted investments.

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Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

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-Publisher FASB
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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

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