Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Remaining Unfunded Commitments to Venture Capital or Private Equity Funds by our Consolidated Managed Funds (Details) $ in Millions	Sep. 30, 2021 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Unfunded Commitments	$ 3

Unfunded commitments to invest in funds as of the reporting date

No definition available.

Name:	sivb_OtherCommitmentUnfundedCommitmentsToInvestInFunds
Namespace Prefix:	sivb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant