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Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) Contract | Sep. 30, 2018 USD ($) Contract | Sep. 30, 2017 USD ($) Contract
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract | 2 | 2 | 1
Pre- Modification Outstanding Recorded Investment | $ 133 | $ 133 | $ 13
Post-Modification Outstanding Recorded Investment | $ 133 | $ 133 | $ 13
Residential Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract | 1 | 1 | 1
Pre- Modification Outstanding Recorded Investment | $ 23 | $ 23 | $ 13
Post-Modification Outstanding Recorded Investment | $ 23 | $ 23 | $ 13
Farm Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract | 1 | 1 |
Pre- Modification Outstanding Recorded Investment | $ 110 | $ 110 |
Post-Modification Outstanding Recorded Investment | $ 110 | $ 110 |

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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