Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial assets
Securities available-for-sale	$ 97,752	$ 103,875
Securities held-to-maturity	25,491	23,444
Loans held for sale	246
Bank-owned life insurance	13,218	10,361
Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	270	261
Carrying Value [Member]
Financial assets
Cash and cash equivalents	36,420	36,838
Securities available-for-sale	97,752	103,875
Securities held-to-maturity	25,758	23,883
Restricted stock	4,614	4,614
Loans held for sale	246
Net loans	511,226	470,158
Bank-owned life insurance	13,218	10,361
Accrued interest receivable	1,545	1,409
Financial liabilities
Deposits	583,259	540,785
Short-term borrowings	39,480	48,742
Other borrowings	11,409	12,385
Accrued interest payable	90	76
Carrying Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	270	261
Fair Value [Member]
Financial assets
Cash and cash equivalents	36,420	36,838
Securities available-for-sale	97,752	103,875
Securities held-to-maturity	25,491	23,444
Loans held for sale	246
Net loans	513,106	471,815
Bank-owned life insurance	13,218	10,361
Accrued interest receivable	1,545	1,409
Financial liabilities
Deposits	583,691	541,318
Short-term borrowings	39,480	48,742
Other borrowings	10,365	12,511
Accrued interest payable	90	76
Fair Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	270	261
Fair Value [Member] \| Level I [Member]
Financial assets
Cash and cash equivalents	36,420	36,838
Securities available-for-sale	1,087	1,081
Loans held for sale	246
Bank-owned life insurance	13,218	10,361
Accrued interest receivable	1,545	1,409
Financial liabilities
Deposits	473,467	428,676
Short-term borrowings	39,480	48,742
Accrued interest payable	90	76
Fair Value [Member] \| Level II [Member]
Financial assets
Securities available-for-sale	96,665	102,794
Securities held-to-maturity	25,491	23,444
Fair Value [Member] \| Level III [Member]
Financial assets
Net loans	513,106	471,815
Financial liabilities
Deposits	110,224	112,642
Other borrowings	10,365	12,511
Fair Value [Member] \| Level III [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	$ 270	$ 261

Accrued interest payable fair value disclosure.

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Accrued interest receivable fair value disclosure.

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- Definition

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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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 investments in debt securities classified as 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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