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Intangible Assets and Goodwill - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 05, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill |  | $ 149,922 | $ 148,604
Citizens Bankshares, Inc [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Date of acquisition | Mar. 05, 2020 |  |
Goodwill | $ 1,300 |  |

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