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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Repurchase liability	$ 140	$ 139

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Repurchase liability.

+ References

No definition available.

+ Details

Name:	vel_RepurchaseLiability
Namespace Prefix:	vel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant