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