Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Employee Stock Ownership Plan (ESOP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares Issued Under Employee Benefit plan	361,500
Blue Ridge ESOP [Member]
Defined Benefit Plan Disclosure [Line Items]
Shares Issued Under Employee Benefit plan	192,066	156,087
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Plan Contributions by Employer	$ 703
Accumulated benefit obligation	1,100
Funded Asset for the Pension Plan	1,159	$ 0
Funded (unfunded) status, end of year	10
PRB Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit Plan Contributions by Employer	6
Funded Asset for the Pension Plan	0	0
Funded (unfunded) status, end of year	$ (52)
Contribution Plan, Description	the Bay Banks Merger, the Company also assumed a post-retirement benefit plan (the “PRB Plan”) covering retirees who were age 55 with 10 years of service or age 65 with five years of service prior to March 1, 2018, when the plan was curtailed. The PRB Plan provides coverage toward a retiree’s eligible medical and life insurance benefits. The PRB Plan is unfunded and benefits are expensed as incurred.
PRB Plan [Member] | Unfunded Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 52
The 401k Profit Sharing Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Expense	$ 2,500	$ 1,200
Maximum [Member] | The 401k Profit Sharing Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Employer Matching Contribution	5.00%