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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | $ 3,777 | $ 4,996 | $ 3,687 | $ 5,689
Interest Income Recognized | 40 | 52 | 122 | 175
Commercial and Agriculture [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 675 | 1,366 | 704 | 1,609
Interest Income Recognized | 6 | 7 | 19 | 27
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 511 | 1,377 | 641 | 1,632
Interest Income Recognized | 9 | 18 | 26 | 66
Commercial Real Estate Non Owner Occupied [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 38 | 202 | 41 | 280
Interest Income Recognized | 1 | 2 | 4 | 5
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 1,811 | 1,437 | 1,580 | 1,554
Interest Income Recognized | 17 | 17 | 51 | 56
Farm Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Average Recorded Investment | 742 | 614 | 721 | 614
Interest Income Recognized | $ 7 | $ 8 | $ 22 | $ 21

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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