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Loans - Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Loans: |  |  |  |
Loans - Gross | $ 708,337 | $ 686,516 |  |
Less: Net deferred loan fees and costs | (677) | (638) |  |
Loans after net deferred loan fees and costs | 707,660 | 685,878 | $ 614,709 |
Less: Allowance for loan losses | (6,285) | (6,057) |  | $ (5,905)
Loans - Net | 701,375 | 679,821 |  |
Agricultural Real Estate [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 59,533 | 58,525 |  |
Loans after net deferred loan fees and costs | 59,479 | 58,463 | 51,396 |
Agricultural [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 77,909 | 82,654 |  |
Loans after net deferred loan fees and costs | 78,021 | 82,762 | 71,571 |
Industrial Development Bonds [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 6,420 | 6,491 |  |
Loans after net deferred loan fees and costs | 6,420 | 6,491 |  |
Consumer Real Estate [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 88,365 | 88,189 |  |
Loans after net deferred loan fees and costs | 88,097 | 87,947 | 97,019 |
Commercial Real Estate [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 345,223 | 322,762 |  |
Loans after net deferred loan fees and costs | 344,661 | 322,230 | 271,201 |
Consumer [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 27,995 | 27,770 |  |
Loans after net deferred loan fees and costs | 28,016 | 27,787 | $ 23,627 |
Commercial and Industrial [Member] |  |  |  |
Loans: |  |  |  |
Loans - Gross | 102,892 | 100,125 |  |
Loans after net deferred loan fees and costs | $ 102,966 | $ 100,198 |  |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 Reference 3: 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(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
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