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Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) Contract | Jun. 30, 2018 USD ($) Contract | Jun. 30, 2017 USD ($) Contract
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract | 1 | 3 | 1
Pre- Modification Outstanding Recorded Investment | $ 13 | $ 591 | $ 13
Post-Modification Outstanding Recorded Investment | $ 13 | $ 591 | $ 13
Commercial and Agriculture [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract |  | 3 |
Pre- Modification Outstanding Recorded Investment |  | $ 591 |
Post-Modification Outstanding Recorded Investment |  | $ 591 |
Residential Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Number of Contracts | Contract | 1 |  | 1
Pre- Modification Outstanding Recorded Investment | $ 13 |  | $ 13
Post-Modification Outstanding Recorded Investment | $ 13 |  | $ 13

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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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