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Fair Value of Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financial Assets:
Cash and Cash Equivalents	$ 39,908	$ 34,467	$ 39,894	$ 28,322
Interest-bearing time deposits	4,019	4,018
Securities - available-for-sale	192,859	196,398
Loans held for sale	2,769	1,221
Loans, net	827,937	816,156
Financial Liabilities:
Non-interest bearing Deposits	193,665	199,114
Time Deposits	186,345	187,566
Total deposits	953,338	919,340
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	23,307	39,495
Federal Home Loan Bank advances	5,000	5,000
Reported Value Measurement [Member]
Financial Assets:
Cash and Cash Equivalents	39,908	34,467
Interest-bearing time deposits	4,019	4,018
Securities - available-for-sale	192,859	196,398
Other Securities	3,717	3,717
Loans held for sale	2,769	1,221
Loans, net	827,937	816,156
Interest receivable	3,782	4,276
Financial Liabilities:
Interest bearing Deposits	573,328	532,660
Non-interest bearing Deposits	193,665	199,114
Time Deposits	186,345	187,566
Total deposits	953,338	919,340
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	23,307	39,495
Federal Home Loan Bank advances	5,000	5,000
Interest payable	302	318
Fair Value [Member]
Financial Assets:
Cash and Cash Equivalents	39,908	34,467
Interest-bearing time deposits	4,019	4,009
Securities - available-for-sale	192,859	196,398
Other Securities	3,717	3,717
Loans held for sale	2,769	1,221
Loans, net	813,272	819,193
Interest receivable	3,782	4,276
Financial Liabilities:
Interest bearing Deposits	574,512	532,660
Non-interest bearing Deposits	193,665	199,114
Time Deposits	186,392	188,335
Total deposits	954,569	920,109
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	23,307	39,495
Federal Home Loan Bank advances	4,882	5,021
Interest payable	302	318
Level 1 [Member]
Financial Assets:
Cash and Cash Equivalents	39,908	34,467
Securities - available-for-sale	20,839	20,978
Level 2 [Member]
Financial Assets:
Interest-bearing time deposits	4,019	4,009
Securities - available-for-sale	170,597	173,992
Financial Liabilities:
Non-interest bearing Deposits	193,665	199,114
Total deposits	193,665	199,114
Level 3 [Member]
Financial Assets:
Securities - available-for-sale	1,423	1,428
Other Securities	3,717	3,717
Loans held for sale	2,769	1,221
Loans, net	813,272	819,193
Interest receivable	3,782	4,276
Financial Liabilities:
Interest bearing Deposits	574,512	532,660
Time Deposits	186,392	188,335
Total deposits	760,904	720,995
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase	23,307	39,495
Federal Home Loan Bank advances	4,882	5,021
Interest payable	$ 302	$ 318

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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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