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Allowance for Loan Losses - Schedule of TDR (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($) Contract | Jun. 30, 2018 USD ($) Contract
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Number of Contracts | Contract | 1 | 3
Pre- Modification Outstanding Recorded Investment | $ 382 | $ 591
Post-Modification Outstanding Recorded Investment | $ 382 | $ 591
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
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Number of Contracts | Contract | 1 |
Pre- Modification Outstanding Recorded Investment | $ 382 |
Post-Modification Outstanding Recorded Investment | $ 382 |

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