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Fair Value of Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Financial Assets:
Cash and Cash Equivalents	$ 39,894	$ 28,322	$ 25,908	$ 22,018
Interest-bearing time deposits	1,845	1,915
Securities - available-for-sale	206,388	218,527
Loans held for sale	1,067	2,055
Loans, net	764,356	751,310
Financial Liabilities:
Non-interest bearing Deposits	178,153	186,390
Time Deposits	187,944	198,830
Total deposits	894,691	842,203
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	27,961	70,324
Federal Home Loan Bank advances	10,000	10,000
Reported Value Measurement [Member]
Financial Assets:
Cash and Cash Equivalents	39,894	28,322
Interest-bearing time deposits	1,845	1,915
Securities - available-for-sale	206,388	218,527
Other Securities	3,717	3,717
Loans held for sale	1,067	2,055
Loans, net	764,356	751,310
Interest receivable	4,192	3,880
Financial Liabilities:
Interest bearing Deposits	528,594	456,983
Non-interest bearing Deposits	178,153	186,390
Time Deposits	187,944	198,830
Total deposits	894,691	842,203
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	27,961	70,324
Federal Home Loan Bank advances	10,000	10,000
Interest payable	241	256
Fair Value [Member]
Financial Assets:
Cash and Cash Equivalents	39,894	28,322
Interest-bearing time deposits	1,845	1,918
Securities - available-for-sale	206,388	218,527
Other Securities	3,717	3,717
Loans held for sale	1,067	2,055
Loans, net	765,974	753,357
Interest receivable	4,192	3,880
Financial Liabilities:
Interest bearing Deposits	528,664	456,983
Non-interest bearing Deposits	178,153	186,390
Time Deposits	187,868	199,658
Total deposits	894,685	843,031
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	27,961	70,324
Federal Home Loan Bank advances	10,041	10,041
Interest payable	241	256
Level 1 [Member]
Financial Assets:
Cash and Cash Equivalents	39,894	28,322
Securities - available-for-sale	19,735	24,775
Level 2 [Member]
Financial Assets:
Interest-bearing time deposits	1,845	1,918
Securities - available-for-sale	185,239	192,334
Financial Liabilities:
Non-interest bearing Deposits	178,153	186,390
Total deposits	178,153	186,390
Level 3 [Member]
Financial Assets:
Securities - available-for-sale	1,414	1,418
Other Securities	3,717	3,717
Loans held for sale	1,067	2,055
Loans, net	765,974	753,357
Interest receivable	4,192	3,880
Financial Liabilities:
Interest bearing Deposits	528,664	456,983
Time Deposits	187,868	199,658
Total deposits	716,532	656,641
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	27,961	70,324
Federal Home Loan Bank advances	10,041	10,041
Interest payable	$ 241	$ 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 borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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

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Amount after offset of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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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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