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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets, Other than Goodwill (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Net Carrying Amount | $ 7,738 |
Core deposit intangibles [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 8,527 | $ 8,527
Accumulated Amortization | 3,365 | 2,698
Net Carrying Amount | $ 5,162 | $ 5,829

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