Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial assets
Securities available-for-sale	$ 112,146	$ 85,528
Securities held-to-maturity	13,950	20,118
Equity securities	92	83
Loans held for sale	622	108
Bank-owned life insurance	18,894	13,554
Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	328	281
Carrying Value [Member]
Financial assets
Cash and cash equivalents	102,017	45,564
Securities available-for-sale	112,146	85,528
Securities held-to-maturity	13,869	20,688
Equity securities	92	83
Restricted stock	4,614	4,614
Loans held for sale	622	108
Net loans	544,616	543,067
Bank-owned life insurance	18,894	13,554
Accrued interest receivable	1,641	1,581
Financial liabilities
Deposits	683,546	606,498
Short-term borrowings	38,889	37,415
Other borrowings	6,330	8,525
Accrued interest payable	127	88
Carrying Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	328	281
Fair Value [Member]
Financial assets
Cash and cash equivalents	102,017	45,564
Securities available-for-sale	112,146	85,528
Securities held-to-maturity	13,950	20,118
Equity securities	92	83
Loans held for sale	622	108
Net loans	542,981	543,076
Bank-owned life insurance	18,894	13,554
Accrued interest receivable	1,641	1,581
Financial liabilities
Deposits	683,425	604,441
Short-term borrowings	38,889	37,415
Other borrowings	6,273	8,251
Accrued interest payable	127	88
Fair Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	328	281
Fair Value [Member] \| Level I [Member]
Financial assets
Cash and cash equivalents	102,017	45,564
Securities available-for-sale	999	996
Equity securities	46	37
Loans held for sale	622	108
Bank-owned life insurance	18,894	13,554
Accrued interest receivable	1,641	1,581
Financial liabilities
Deposits	555,985	490,007
Short-term borrowings	38,889	37,415
Accrued interest payable	127	88
Fair Value [Member] \| Level II [Member]
Financial assets
Securities available-for-sale	111,147	84,532
Securities held-to-maturity	13,950	20,118
Fair Value [Member] \| Level III [Member]
Financial assets
Equity securities	46	46
Net loans	542,981	543,076
Financial liabilities
Deposits	127,440	114,434
Other borrowings	6,273	8,251
Fair Value [Member] \| Level III [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	$ 328	$ 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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-SubTopic 30
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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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