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Allowance for Loan Losses - Impaired Financing Receivables - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
Impaired financing receivables, Average Recorded Investment, Total | $ 9,420 | $ 15,319 | $ 22,051
Impaired financing receivables, Interest Income Recognized, Total | 451 | 570 | 989
Commercial and Agriculture [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 1,519 | 3,316 | 4,761
Impaired financing receivables, Interest Income Recognized, Total | 72 | 104 | 186
Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 2,738 | 5,720 | 6,065
Impaired financing receivables, Interest Income Recognized, Total | 139 | 200 | 417
Commercial Real Estate Non Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 1,946 | 2,767 | 5,855
Impaired financing receivables, Interest Income Recognized, Total | 32 | 40 | 85
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 2,544 | 3,291 | 4,792
Impaired financing receivables, Interest Income Recognized, Total | 152 | 207 | 282
Real Estate Construction [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 16 |  | 302
Farm Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired financing receivables, Average Recorded Investment, Total | 653 | 219 | 246
Impaired financing receivables, Interest Income Recognized, Total | 56 | 19 | 19
Consumer and Other [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired financing receivables, Average Recorded Investment, Total | $ 4 | $ 6 | $ 30

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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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