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Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) Contract | Jun. 30, 2019 USD ($) Loan Contract | Dec. 31, 2018 Loan
Financing Receivable Modifications [Line Items] |  |  |
Number of Contracts Modified in the Last three Months | Loan |  | 4 | 0
Commercial and Industrial [Member] |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of Contracts Modified in the Last three Months | Contract | 4 | 4 |
Pre-Modification Outstanding Recorded Investment | $ 812 | $ 812 |
Post-Modification Outstanding Recorded Investment | $ 812 | $ 812 |

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