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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) Contract | Sep. 30, 2019 USD ($) Loan Contract | Dec. 31, 2018 Loan
Financing Receivable Modifications [Line Items] |  |  |
Number of Contracts Modified in the Last three Months | Loan |  | 5 | 0
Consumer Real Estate [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of Contracts Modified in the Last three Months | Contract | 1 | 1 |
Pre-Modification Outstanding Recorded Investment | $ 74 | $ 74 |
Post-Modification Outstanding Recorded Investment | $ 74 | $ 74 |
Commercial and Industrial [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of Contracts Modified in the Last three Months | Contract |  | 4 |
Pre-Modification Outstanding Recorded Investment |  | $ 812 |
Post-Modification Outstanding Recorded Investment |  | $ 812 |

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