Commitments and Contingencies - Additional Information (Detail) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Undisbursed loan commitments	$ 62,900,000
Time deposits	308,801,000	$ 293,078,000
Outstanding borrowings	31,000,000	11,000,000
Securities with a fair market value sold under agreements to repurchase from various customers	117,400,000	125,600,000
Securities pledged to municipalities for deposits in excess of FDIC limits, market value	120,100,000	$ 128,400,000
Federal Home Loan Bank of Cincinnati [Member]
Loss Contingencies [Line Items]
Letters of credit	47,600,000
Securities with a fair market value sold under agreements to repurchase from various customers	38,100,000
Securities pledged to municipalities for deposits in excess of FDIC limits, market value	39,300,000
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Letters of credit	140,000
Home Equity Lines of Credit [Member]
Loss Contingencies [Line Items]
Lines of credit outstanding	33,300,000
Personal Lines of Credit [Member]
Loss Contingencies [Line Items]
Lines of credit outstanding	16,000,000
Loan Origination Commitments [Member]
Loss Contingencies [Line Items]
Outstanding commitments	50,900,000
One Year [Member]
Loss Contingencies [Line Items]
Time deposits	38,300,000
One Year [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Certificates of deposits	100,000
One Year [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Certificates of deposits	250,000
One Year Or Less [Member]
Loss Contingencies [Line Items]
Time deposits	73,000,000
One Year Or Less [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Certificates of deposits	$ 250,000

Securities loaned or sold under agreements to repurchase book value disclosure.

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Undisbursed loan commitments.

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Amount of time deposit liabilities, including certificates of deposit.

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