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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) Segment shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Fair value adjustments on other investments | $ 7,300,000 |  |
Other equity investments | 14,200,000 | $ 3,000,000.0 |
Loans held for sale | 121,943,000 | 152,931,000 |
Allowance for loan losses | 12,121,000 | 13,827,000 | $ 4,572,000
Lease Income | 0 | 0 |
Impairment of goodwill | $ 0 | $ 0 |
Effect of dilutive securities | shares | 9,898 | 0 |
Number of reportable business segments | Segment | 3 |  |
Dilutive common shares outstanding | shares | 9,898 | 0 |
Leasehold Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | improvements or the lease term |  |
Purchased Computer Software [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 1 year |  |
Purchased Computer Software [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Building [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 39 years |  |
Building [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 40 years |  |
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives | 15 years |  |
Substandard [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Troubled debt restructuring | $ 500,000,000 |  |
Virginia Community Bankshares, Inc [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Allowance for loan losses | 0 |  |
Fintech [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loans held for sale | $ 5,800,000 | $ 4,700,000 |

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