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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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- Definition 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
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- Definition The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.1,2,3) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The aggregate of all domestic and foreign interest-bearing deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.2) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=73530178&loc=d3e59706-112781 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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