Business Segments - Summary of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Interest income	$ 23,754	$ 14,444	$ 80,142	$ 38,034
Gain on sale of Paycheck Protection Program loans			24,315
Residential mortgage banking income, net	7,704	14,400	24,259	31,969
Gain on sale of guaranteed government loans	108	516	1,325	779
Increase in cash surrender value of bank owned life insurance	278	94	679	278
Bank and purchase card, net	497	211	1,096	483
Total Revenues	37,272	32,057	145,894	76,840
Interest expense	2,630	2,615	8,539	7,537
Provision for loan losses		4,000		8,075
Salaries and employee benefits	14,774	11,880	46,425	29,886
Merger-related	1,441	1,264	11,697	1,710
Other	9,422	5,532	28,575	13,897
Total expense	28,267	25,291	95,236	61,105
Income (loss) before income taxes	9,005	6,766	50,658	15,735
Income tax expense (benefit)	2,199	1,707	10,973	3,618
Net income (loss)	6,806	5,059	39,685	12,117
Net loss (income) attributable to noncontrolling interest	4	4	(1)	(1)
Net income (loss) attributable to Blue Ridge Bankshares, Inc.	6,810	5,063	39,684	12,116
Wealth and Trust Management [Member]
Segment Reporting Information [Line Items]
Revenues	499		1,934
Service Charge on Deposit Accounts [Member]
Segment Reporting Information [Line Items]
Revenues	376	215	1,073	669
Payroll Processing Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	223	221	706	736
Mortgage Servicing Rights [Member]
Segment Reporting Information [Line Items]
Revenues	1,827	1,645	6,905	3,241
Other Income [Member]
Segment Reporting Information [Line Items]
Revenues	2,006	311	3,460	651
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Interest income	23,019	13,495	77,501	35,985
Gain on sale of Paycheck Protection Program loans			24,315
Gain on sale of guaranteed government loans	108	516	1,325	779
Increase in cash surrender value of bank owned life insurance	278	94	679	278
Bank and purchase card, net	497	211	1,096	483
Total Revenues	25,979	15,069	110,446	39,599
Interest expense	1,913	2,132	6,209	6,440
Provision for loan losses		4,000		8,075
Salaries and employee benefits	7,417	3,425	24,118	9,665
Merger-related	216	19	9,350	405
Other	8,563	3,348	22,793	8,549
Total expense	18,109	12,924	62,470	33,134
Income (loss) before income taxes	7,870	2,145	47,976	6,465
Income tax expense (benefit)	1,943	523	10,350	1,445
Net income (loss)	5,927	1,622	37,626	5,020
Net loss (income) attributable to noncontrolling interest	4	4	(1)	(1)
Net income (loss) attributable to Blue Ridge Bankshares, Inc.	5,931	1,626	37,625	5,019
Commercial Banking [Member] | Wealth and Trust Management [Member]
Segment Reporting Information [Line Items]
Revenues	499		1,934
Commercial Banking [Member] | Service Charge on Deposit Accounts [Member]
Segment Reporting Information [Line Items]
Revenues	376	215	1,073	669
Commercial Banking [Member] | Payroll Processing Revenue [Member]
Segment Reporting Information [Line Items]
Revenues	223	221	706	736
Commercial Banking [Member] | Other Income [Member]
Segment Reporting Information [Line Items]
Revenues	979	317	1,817	669
Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Interest income	706	917	2,536	2,012
Residential mortgage banking income, net	7,704	14,400	24,259	31,969
Total Revenues	10,237	16,962	33,700	37,222
Interest expense	73	72	188	243
Salaries and employee benefits	7,357	8,455	22,307	20,221
Other	693	2,133	5,130	4,914
Total expense	8,123	10,660	27,625	25,378
Income (loss) before income taxes	2,114	6,302	6,075	11,844
Income tax expense (benefit)	421	1,276	1,238	2,440
Net income (loss)	1,693	5,026	4,837	9,404
Net income (loss) attributable to Blue Ridge Bankshares, Inc.	1,693	5,026	4,837	9,404
Mortgage Banking [Member] | Mortgage Servicing Rights [Member]
Segment Reporting Information [Line Items]
Revenues	1,827	1,645	6,905	3,241
Parents Only [Member]
Segment Reporting Information [Line Items]
Interest income	29	32	105	37
Total Revenues	1,104	32	1,883	37
Interest expense	644	411	2,142	854
Merger-related	1,225	1,245	2,347	1,305
Other	214	57	787	452
Total expense	2,083	1,713	5,276	2,611
Income (loss) before income taxes	(979)	(1,681)	(3,393)	(2,574)
Income tax expense (benefit)	(165)	(92)	(615)	(267)
Net income (loss)	(814)	(1,589)	(2,778)	(2,307)
Net income (loss) attributable to Blue Ridge Bankshares, Inc.	(814)	(1,589)	(2,778)	(2,307)
Parents Only [Member] | Other Income [Member]
Segment Reporting Information [Line Items]
Revenues	1,075		1,778
Eliminations [Member]
Segment Reporting Information [Line Items]
Total Revenues	(48)	(6)	(135)	(18)
Other	(48)	(6)	(135)	(18)
Total expense	(48)	(6)	(135)	(18)
Eliminations [Member] | Other Income [Member]
Segment Reporting Information [Line Items]
Revenues	$ (48)	$ (6)	$ (135)	$ (18)