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Fair Value of Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Financial Assets:
Cash and Cash Equivalents	$ 49,104	$ 28,322	$ 31,498	$ 22,018
Interest-bearing time deposits	2,541	1,915
Securities - available-for-sale	192,811	218,527
Loans held for sale	2,147	2,055
Loans, net	788,335	751,310
Financial Liabilities:
Non-interest bearing Deposits	189,963	186,390
Time Deposits	193,581	198,830
Total deposits	903,366	842,203
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	35,550	70,324
Federal Home Loan Bank advances	10,000	10,000
Reported Value Measurement [Member]
Financial Assets:
Cash and Cash Equivalents	49,104	28,322
Interest-bearing time deposits	2,541	1,915
Securities - available-for-sale	192,811	218,527
Other Securities	3,717	3,717
Loans held for sale	2,147	2,055
Loans, net	788,335	751,310
Interest receivable	5,106	3,880
Financial Liabilities:
Interest bearing Deposits	519,822	456,983
Non-interest bearing Deposits	189,963	186,390
Time Deposits	193,581	198,830
Total deposits	903,366	842,203
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	35,550	70,324
Federal Home Loan Bank advances	10,000	10,000
Interest payable	285	256
Fair Value [Member]
Financial Assets:
Cash and Cash Equivalents	49,104	28,322
Interest-bearing time deposits	2,541	1,918
Securities - available-for-sale	192,811	218,527
Other Securities	3,717	3,717
Loans held for sale	2,147	2,055
Loans, net	790,893	753,357
Interest receivable	5,106	3,880
Financial Liabilities:
Interest bearing Deposits	519,865	456,983
Non-interest bearing Deposits	189,963	186,390
Time Deposits	194,342	199,658
Total deposits	904,170	843,031
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	35,550	70,324
Federal Home Loan Bank advances	10,041	10,041
Interest payable	285	256
Level 1 [Member]
Financial Assets:
Cash and Cash Equivalents	49,104	28,322
Securities - available-for-sale	15,676	24,775
Level 2 [Member]
Financial Assets:
Interest-bearing time deposits	2,541	1,918
Securities - available-for-sale	175,693	192,334
Financial Liabilities:
Non-interest bearing Deposits	189,963	186,390
Total deposits	189,963	186,390
Level 3 [Member]
Financial Assets:
Securities - available-for-sale	1,442	1,418
Other Securities	3,717	3,717
Loans held for sale	2,147	2,055
Loans, net	790,893	753,357
Interest receivable	5,106	3,880
Financial Liabilities:
Interest bearing Deposits	519,865	456,983
Time Deposits	194,342	199,658
Total deposits	714,207	656,641
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	35,550	70,324
Federal Home Loan Bank advances	10,041	10,041
Interest payable	$ 285	$ 256

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Other Securities consists of Federal Home Loan Bank of Cincinnati and Indianapolis stock and Farmer Mac stock. These stocks are carried at cost and are held to enable the Bank to conduct business with the entities. The Federal Home Loan Banks sell and purchase their stock at par; therefore cost approximates market value. The Federal Home Loan Bank of Cincinnati stock is held as collateral security for all indebtedness of the Bank to the Federal Home Loan Bank.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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