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Allowance for Loan Losses - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | $ 8,740 | $ 10,395 | $ 8,278 | $ 10,646
Impaired loans, Interest Income Recognized, Total | 122 | 124 | 247 | 247
Commercial and Agriculture [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | 2,469 | 1,762 | 1,937 | 1,943
Impaired loans, Interest Income Recognized, Total | 41 | 11 | 80 | 37
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | 1,630 | 3,277 | 1,800 | 3,300
Impaired loans, Interest Income Recognized, Total | 24 | 50 | 50 | 97
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | 1,363 | 1,992 | 1,489 | 2,053
Impaired loans, Interest Income Recognized, Total | 13 | 10 | 26 | 19
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | 1,878 | 2,471 | 1,799 | 2,752
Impaired loans, Interest Income Recognized, Total | 29 | 39 | 60 | 66
Real Estate Construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total |  | 40 |  | 27
Farm Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | 1,398 | 848 | 1,250 | 566
Impaired loans, Interest Income Recognized, Total | 15 | 14 | 31 | 28
Consumer and Other [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | $ 2 | $ 5 | $ 3 | $ 5

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 + Details
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