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Allowance for Loan Losses - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans, Average Recorded Investment, Total | $ 7,717 | $ 9,420 | $ 15,319
Impaired loans, Interest Income Recognized, Total | 1,256 | 384 | 570
Commercial and Agriculture [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans, Average Recorded Investment, Total | 2,036 | 1,519 | 3,316
Impaired loans, Interest Income Recognized, Total | 40 | 54 | 104
Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans, Average Recorded Investment, Total | 1,847 | 2,738 | 5,720
Impaired loans, Interest Income Recognized, Total | 862 | 139 | 200
Commercial Real Estate Non Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans, Average Recorded Investment, Total | 1,039 | 1,946 | 2,767
Impaired loans, Interest Income Recognized, Total | 83 | 32 | 40
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans, Average Recorded Investment, Total | 1,787 | 2,544 | 3,291
Impaired loans, Interest Income Recognized, Total | 175 | 103 | 207
Real Estate Construction [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans, Average Recorded Investment, Total |  | 16 |
Impaired loans, Interest Income Recognized, Total | 1 |  |
Farm Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans, Average Recorded Investment, Total | 1,006 | 653 | 219
Impaired loans, Interest Income Recognized, Total | 95 | 56 | 19
Consumer and Other [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans, Average Recorded Investment, Total | $ 2 | $ 4 | $ 6

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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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