Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financial assets:
Securities available-for-sale	$ 127,969	$ 100,108
Securities held-to-maturity	34,011	38,950
Bank-owned life insurance	10,085	9,815
Mortgage Servicing Rights [Member]
Financial assets:
Mortgage servicing rights	246	222
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	38,272	43,923
Securities available-for-sale	127,969	100,108
Securities held-to-maturity	33,819	38,316
Restricted stock	4,614	4,614
Loans held for sale	47	75
Net loans	418,209	406,522
Bank-owned life insurance	10,085	9,815
Accrued interest receivable	1,513	1,329
Financial liabilities:
Deposits	525,042	500,075
Short-term borrowings	48,598	46,627
Other borrowings	13,465	14,953
Accrued interest payable	80	84
Carrying Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets:
Mortgage servicing rights	246	222
Fair Value [Member]
Financial assets:
Cash and cash equivalents	38,272	43,923
Securities available-for-sale	127,969	100,108
Securities held-to-maturity	34,011	38,950
Restricted stock	4,614	4,614
Loans held for sale	47	75
Net loans	420,181	411,168
Bank-owned life insurance	10,085	9,815
Accrued interest receivable	1,513	1,329
Financial liabilities:
Deposits	525,643	500,757
Short-term borrowings	48,598	46,627
Other borrowings	13,667	15,348
Accrued interest payable	80	84
Fair Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets:
Mortgage servicing rights	246	222
Fair Value [Member] \| Level I [Member]
Financial assets:
Cash and cash equivalents	38,272	43,923
Securities available-for-sale	1,064	1,128
Restricted stock	4,614	4,614
Loans held for sale	47	75
Bank-owned life insurance	10,085	9,815
Accrued interest receivable	1,513	1,329
Financial liabilities:
Deposits	405,776	372,312
Short-term borrowings	48,598	46,627
Accrued interest payable	80	84
Fair Value [Member] \| Level II [Member]
Financial assets:
Securities available-for-sale	126,905	98,980
Securities held-to-maturity	34,011	38,950
Fair Value [Member] \| Level III [Member]
Financial assets:
Net loans	420,181	411,168
Financial liabilities:
Deposits	119,867	128,445
Other borrowings	13,667	15,348
Fair Value [Member] \| Level III [Member] \| Mortgage Servicing Rights [Member]
Financial assets:
Mortgage servicing rights	$ 246	$ 222

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 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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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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