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Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair value assets transfers	$ 0	$ 0
Increase in fair value of liabilities	$ 11,100,000	$ 4,700,000

X

- Definition

Fair value assets level to level transfers amount.

+ References

No definition available.

+ Details

Name:	tvac_FairValueAssetsLevelToLevelTransfersAmount
Namespace Prefix:	tvac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of increase (decrease) in fair value adjustment on other assets (liabilities) carried at fair value under the fair value option on the statement of cash flows of Federal Home Loan Banks (FHLBanks).

+ References

No definition available.

+ Details

Name:	us-gaap_IncreaseDecreaseInFairValueAdjustmentsOnAssetsAndLiabilitiesCarriedAtFairValueUnderFairValueOption
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration