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Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Aug. 15, 2019 | Dec. 31, 2018
Goodwill [Line Items] |  |  |
Goodwill | $ 147,013 |  | $ 79,749
Pegasus Bank [Member] |  |  |
Goodwill [Line Items] |  |  |
Date of acquisition | Aug. 15, 2019 |  |
Goodwill | $ 67,264 | $ 67,300 |

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