Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financial assets
Securities available-for-sale	$ 89,572	$ 85,528
Securities held-to-maturity	15,192	20,118
Equity securities	91	83
Loans held for sale	399	108
Bank-owned life insurance	16,880	13,554
Carrying Value [Member]
Financial assets
Cash and cash equivalents	79,569	45,564
Securities available-for-sale	89,572	85,528
Securities held-to-maturity	15,097	20,688
Equity securities	91	83
Restricted stock	4,614	4,614
Loans held for sale	399	108
Net loans	559,437	543,067
Bank-owned life insurance	16,880	13,554
Accrued interest receivable	1,820	1,581
Financial liabilities
Deposits	658,119	606,498
Short-term borrowings	35,070	37,415
Other borrowings	6,453	8,525
Accrued interest payable	123	88
Carrying Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	311	281
Fair Value [Member]
Financial assets
Cash and cash equivalents	79,569	45,564
Securities available-for-sale	89,572	85,528
Securities held-to-maturity	15,192	20,118
Equity securities	91	83
Loans held for sale	399	108
Net loans	563,354	543,076
Bank-owned life insurance	16,880	13,554
Accrued interest receivable	1,820	1,581
Financial liabilities
Deposits	658,192	604,441
Short-term borrowings	35,070	37,415
Other borrowings	6,427	8,251
Accrued interest payable	123	88
Fair Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	311	281
Fair Value [Member] \| Level I [Member]
Financial assets
Cash and cash equivalents	79,569	45,564
Securities available-for-sale	997	996
Equity securities	45	37
Loans held for sale	399	108
Bank-owned life insurance	16,880	13,554
Accrued interest receivable	1,820	1,581
Financial liabilities
Deposits	531,660	490,007
Short-term borrowings	35,070	37,415
Accrued interest payable	123	88
Fair Value [Member] \| Level II [Member]
Financial assets
Securities available-for-sale	88,575	84,532
Securities held-to-maturity	15,192	20,118
Fair Value [Member] \| Level III [Member]
Financial assets
Equity securities	46	46
Net loans	563,354	543,076
Financial liabilities
Deposits	126,532	114,434
Other borrowings	6,427	8,251
Fair Value [Member] \| Level III [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	$ 311	$ 281

Accrued interest payable fair value disclosure.

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Accrued interest receivable fair value disclosure.

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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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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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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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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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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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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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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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