Fair Values of Financial Instruments - Schedule of Fair Values of Recognized Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financial assets
Securities available-for-sale	$ 89,507	$ 97,663
Securities held-to-maturity	20,326	25,491
Equity Securities	87	89
Loans held for sale	192	246
Bank-owned life insurance	13,470	13,218
Carrying Value [Member]
Financial assets
Cash and cash equivalents	33,249	36,420
Securities available-for-sale	89,507	97,663
Securities held-to-maturity	21,260	25,758
Equity Securities	87	89
Restricted stock	4,614	4,614
Loans held for sale	192	246
Net loans	529,220	511,226
Bank-owned life insurance	13,470	13,218
Accrued interest receivable	1,829	1,545
Financial liabilities
Deposits	587,531	583,259
Short-term borrowings	37,465	39,480
Other borrowings	8,676	11,409
Accrued interest payable	77	90
Carrying Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	269	270
Fair Value [Member]
Financial assets
Cash and cash equivalents	33,249	36,420
Securities available-for-sale	89,507	97,663
Securities held-to-maturity	20,326	25,491
Equity Securities	87	89
Loans held for sale	192	246
Net loans	524,389	513,106
Bank-owned life insurance	13,470	13,218
Accrued interest receivable	1,829	1,545
Financial liabilities
Deposits	585,082	583,691
Short-term borrowings	37,465	39,480
Other borrowings	7,928	10,365
Accrued interest payable	77	90
Fair Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	269	270
Fair Value [Member] \| Level I [Member]
Financial assets
Cash and cash equivalents	33,249	36,420
Securities available-for-sale	994	998
Equity Securities	41	89
Loans held for sale	192	246
Bank-owned life insurance	13,470	13,218
Accrued interest receivable	1,829	1,545
Financial liabilities
Deposits	470,827	473,467
Short-term borrowings	37,465	39,480
Accrued interest payable	77	90
Fair Value [Member] \| Level II [Member]
Financial assets
Securities available-for-sale	88,513	96,665
Securities held-to-maturity	20,326	25,491
Fair Value [Member] \| Level III [Member]
Financial assets
Equity Securities	46
Net loans	524,389	513,106
Financial liabilities
Deposits	114,255	110,224
Other borrowings	7,928	10,365
Fair Value [Member] \| Level III [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	$ 269	$ 270

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Accrued interest receivable fair value disclosure.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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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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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