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Allowance for Loan Losses - Impaired Financing Receivables - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | $ 8,385 | $ 11,033
Impaired financing receivables, Interest Income Recognized, Total | 125 | 123
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 1,697 | 2,303
Impaired financing receivables, Interest Income Recognized, Total | 39 | 26
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 1,895 | 3,328
Impaired financing receivables, Interest Income Recognized, Total | 26 | 47
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 1,862 | 2,123
Impaired financing receivables, Interest Income Recognized, Total | 13 | 9
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 1,753 | 2,628
Impaired financing receivables, Interest Income Recognized, Total | 31 | 27
Real Estate Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total |  | 20
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 1,175 | 626
Impaired financing receivables, Interest Income Recognized, Total | 16 | 14
Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | $ 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=49124121&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=49124121&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=49124121&loc=d3e5212-111524 + Details
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