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Organization and Basis of Presentation - Additional Information (Detail) $ in Thousands |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 14, 2021 shares | Apr. 30, 2021 | Apr. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Stockholders equity note reverse stocks split conversion ratio |  | 1.5 | 1.5 | 1.5 |  |
Stock split description |  |  | 3-for-2 stock split | In March 2021, the Company’s board of directors approved a three-for-two stock split (“Stock Split”) effected in the form of a 50% stock dividend on the Company’s common stock outstanding paid on April 30, 2021 to shareholders of record as of April 20, 2021. |  |
Percentage of stock dividend payable on stock split of common stock. |  |  |  | 50.00% |  |
Dividend, payment date |  |  |  | Apr. 30, 2021 |  |
Dividend, record date |  |  |  | Apr. 20, 2021 |  |
Loans outstanding |  |  |  |  | $ 0 |
FVCBankcorp, Inc. [Member] |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Common stock shares received by shareholders | shares | 1.1492 |  |  |  |  |
Hammond Insurance Agency [Member] |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Percentage of investments |  |  |  |  | 35.00% |
Correction of Prior Period Classification Error [Member] |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Decrease in loans held for sale |  |  |  |  | $ 30,400 |
Increase in loans held for investment |  |  |  |  | $ 30,400 |
Correction of Prior Period Classification Error [Member] | Hammond Insurance Agency [Member] |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Increase (decrease) goodwill |  |  |  |  |  | $ (613)
Increase (decrease) in intangible asset |  |  |  |  |  | (341)
Increase (decrease) in other investments |  |  |  |  |  | 954
Correction of Prior Period Classification Error [Member] | BluePoint Benefits, LLC [Member] |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |
Increase (decrease) goodwill |  |  |  |  |  | $ 340

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