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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial Assets:
Cash and Cash Equivalents	$ 34,467	$ 28,322	$ 22,018	$ 24,295
Interest-bearing time deposits	4,018	1,915
Securities-available for sale	196,398	218,527
Loans held for sale	1,221	2,055
Loans, net	816,156	751,310
Financial Liabilities:
Non-interest bearing Deposits	199,114	186,390
Time Deposits	187,566	198,830
Total deposits	919,340	842,203
Federal Funds Purchased and Securities sold under agreement to repurchase	39,495	70,324
Federal Home Loan Bank advances	5,000	10,000
Dividends payable	1,193	1,053
Reported Value Measurement [Member]
Financial Assets:
Cash and Cash Equivalents	34,467	28,322
Interest-bearing time deposits	4,018	1,915
Securities-available for sale	196,398	218,527
Other Securities	3,717	3,717
Loans held for sale	1,221	2,055
Loans, net	816,156	751,310
Interest receivable	4,276	3,880
Financial Liabilities:
Interest bearing Deposits	532,660	456,983
Non-interest bearing Deposits	199,114	186,390
Time Deposits	187,566	198,830
Total deposits	919,340	842,203
Federal Funds Purchased and Securities sold under agreement to repurchase	39,495	70,324
Federal Home Loan Bank advances	5,000	10,000
Interest payable	318	256
Dividends payable	1,193	1,053
Fair Value [Member]
Financial Assets:
Cash and Cash Equivalents	34,467	28,322
Interest-bearing time deposits	4,009	1,918
Securities-available for sale	196,398	218,527
Other Securities	3,717	3,717
Loans held for sale	1,221	2,055
Loans, net	819,193	753,357
Interest receivable	4,276	3,880
Financial Liabilities:
Interest bearing Deposits	532,660	456,983
Non-interest bearing Deposits	199,114	186,390
Time Deposits	188,335	199,658
Total deposits	920,109	843,031
Federal Funds Purchased and Securities sold under agreement to repurchase	39,495	70,324
Federal Home Loan Bank advances	5,021	10,041
Interest payable	318	256
Dividends payable	1,193	1,053
Level 1 [Member]
Financial Assets:
Cash and Cash Equivalents	34,467	28,322
Securities-available for sale	20,978	24,775
Level 2 [Member]
Financial Assets:
Interest-bearing time deposits	4,009	1,918
Securities-available for sale	173,992	192,334
Financial Liabilities:
Non-interest bearing Deposits	199,114	186,390
Total deposits	199,114	186,390
Dividends payable	1,193	1,053
Level 3 [Member]
Financial Assets:
Securities-available for sale	1,428	1,418
Other Securities	3,717	3,717
Loans held for sale	1,221	2,055
Loans, net	819,193	753,357
Interest receivable	4,276	3,880
Financial Liabilities:
Interest bearing Deposits	532,660	456,983
Time Deposits	188,335	199,658
Total deposits	720,995	656,641
Federal Funds Purchased and Securities sold under agreement to repurchase	39,495	70,324
Federal Home Loan Bank advances	5,021	10,041
Interest payable	$ 318	$ 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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