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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | $ 5,980 | $ 8,740 | $ 6,166 | $ 8,278
Impaired loans, Interest Income Recognized, Total | 60 | 907 | 123 | 962
Commercial and Agriculture [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | 1,643 | 2,469 | 1,756 | 1,937
Impaired loans, Interest Income Recognized, Total | 6 | 8 | 20 | 11
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | 1,795 | 1,630 | 1,829 | 1,800
Impaired loans, Interest Income Recognized, Total | 26 | 20 | 48 | 45
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | 356 | 1,363 | 357 | 1,489
Impaired loans, Interest Income Recognized, Total | 2 | 853 | 3 | 857
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | 1,572 | 1,878 | 1,610 | 1,799
Impaired loans, Interest Income Recognized, Total | 19 | 20 | 39 | 39
Farm Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total | 614 | 1,398 | 614 | 1,250
Impaired loans, Interest Income Recognized, Total | $ 7 | 6 | $ 13 | 10
Consumer and Other [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans, Average Recorded Investment, Total |  | $ 2 |  | $ 3

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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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