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Allowance for Loan Losses - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | $ 4,996 | $ 7,638 | $ 5,689 | $ 8,223
Interest Income Recognized | 52 | 58 | 175 | 1,020
Commercial and Agriculture [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,366 | 2,401 | 1,609 | 1,453
Interest Income Recognized | 7 | 8 | 27 | 19
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,377 | 1,774 | 1,632 | 1,954
Interest Income Recognized | 18 | 21 | 66 | 66
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 202 | 556 | 280 | 1,519
Interest Income Recognized | 2 | 1 | 5 | 858
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,437 | 1,873 | 1,554 | 1,699
Interest Income Recognized | 17 | 21 | 56 | 60
Real Estate Construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment |  |  |  | 473
Farm Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 614 | 1,032 | 614 | 1,123
Interest Income Recognized | $ 8 | 7 | $ 21 | 17
Consumer and Other [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment |  | $ 2 |  | $ 2

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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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