Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial assets
Securities available-for-sale	$ 103,875	$ 127,969
Securities held-to-maturity	23,444	34,011
Loans held for sale		47
Bank-owned life insurance	10,361	10,085
Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	261	246
Carrying Value [Member]
Financial assets
Cash and cash equivalents	36,838	38,272
Securities available-for-sale	103,875	127,969
Securities held-to-maturity	23,883	33,819
Restricted stock	4,614	4,614
Loans held for sale		47
Net loans	470,158	418,209
Bank-owned life insurance	10,361	10,085
Accrued interest receivable	1,409	1,513
Financial liabilities
Deposits	540,785	525,042
Short-term borrowings	48,742	48,598
Other borrowings	12,385	13,465
Accrued interest payable	76	80
Carrying Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	261	246
Fair Value [Member]
Financial assets
Cash and cash equivalents	36,838	38,272
Securities available-for-sale	103,875	127,969
Securities held-to-maturity	23,444	34,011
Restricted stock	4,614	4,614
Loans held for sale		47
Net loans	471,815	420,181
Bank-owned life insurance	10,361	10,085
Accrued interest receivable	1,409	1,513
Financial liabilities
Deposits	541,318	525,643
Short-term borrowings	48,742	48,598
Other borrowings	12,511	13,667
Accrued interest payable	76	80
Fair Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	261	246
Fair Value [Member] \| Level I [Member]
Financial assets
Cash and cash equivalents	36,838	38,272
Securities available-for-sale	1,081	1,064
Restricted stock	4,614	4,614
Loans held for sale		47
Bank-owned life insurance	10,361	10,085
Accrued interest receivable	1,409	1,513
Financial liabilities
Deposits	428,676	405,776
Short-term borrowings	48,742	48,598
Accrued interest payable	76	80
Fair Value [Member] \| Level II [Member]
Financial assets
Securities available-for-sale	102,794	126,905
Securities held-to-maturity	23,444	34,011
Fair Value [Member] \| Level III [Member]
Financial assets
Net loans	471,815	420,181
Financial liabilities
Deposits	112,642	119,867
Other borrowings	12,511	13,667
Fair Value [Member] \| Level III [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	$ 261	$ 246

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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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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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- 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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- 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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