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Supplemental Financial Information - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Supplemental Financial Information [Abstract]
Deposit Liabilities, Collateral Issued, Financial Instruments	$ 11.2	$ 10.8

X

- Definition

Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

+ Details

Name:	us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Supplemental Financial Information [Abstract]

+ References

No definition available.

+ Details

Name:	val_SupplementalFinancialInformationAbstract
Namespace Prefix:	val_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration