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Allowance for Loan Losses - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | $ 5,243 | $ 7,717 | $ 9,420
Interest Income Recognized | 216 | 1,256 | 384
Commercial and Agriculture [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 1,375 | 2,036 | 1,519
Interest Income Recognized | 34 | 40 | 54
Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 1,507 | 1,847 | 2,738
Interest Income Recognized | 75 | 862 | 139
Commercial Real Estate Non Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 233 | 1,039 | 1,946
Interest Income Recognized | 6 | 83 | 32
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 1,515 | 1,787 | 2,544
Interest Income Recognized | 73 | 175 | 103
Real Estate Construction [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  |  | 16
Interest Income Recognized |  | 1 |
Farm Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 613 | 1,006 | 653
Interest Income Recognized | $ 28 | 95 | 56
Consumer and Other [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment |  | $ 2 | $ 4

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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=84173941&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=84173941&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=84173941&loc=d3e5212-111524 + Details
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