Financing Receivable, Allowance For Credit Loss, Forecast Period

No definition available.

Name:	sivb_FinancingReceivableAllowanceForCreditLossForecastPeriod
Namespace Prefix:	sivb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Classes Of Financing Receivables

+ References

No definition available.

+ Details

Name:	sivb_NumberOfClassesOfFinancingReceivables
Namespace Prefix:	sivb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Loan Portfolio Segments

+ References

No definition available.

+ Details

Name:	sivb_NumberOfLoanPortfolioSegments
Namespace Prefix:	sivb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Risk-Based Segments, Revenue Threshold Of Subcategories

+ References

No definition available.

+ Details

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

- Definition

Sponsor Equity Contribution, Percentage Of Acquisition Price

+ References

No definition available.

+ Details

Name:	sivb_SponsorEquityContributionPercentageOfAcquisitionPrice
Namespace Prefix:	sivb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=sivb_MidStageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=sivb_InvestorDependentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=sivb_EarlyStageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=sivb_LaterStageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=sivb_AccruedInterestReceivableAndOtherAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_LoansReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Basis of Presentation - Allowance for Credit Losses: Loans (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) portfolio_segment class_financing_receivable	Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of portfolio segments \| portfolio_segment	6
Number of classes of financing receivables \| class_financing_receivable	11
Forecast period for estimated credit loss for loans	3 years
Lower Limit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sponsor equity contribution, percentage of acquisition price	50.00%
Mid stage \| Upper Limit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue threshold of portfolio segment subcategories	$ 15.0
Investor dependent
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of portfolio segments \| portfolio_segment	2
Investor dependent \| Early stage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue threshold of portfolio segment subcategories	$ 5.0
Investor dependent \| Mid stage \| Lower Limit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue threshold of portfolio segment subcategories	5.0
Investor dependent \| Later stage
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue threshold of portfolio segment subcategories	15.0
Accrued interest receivable and other assets \| Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued interest receivable	$ 109.3	$ 119.1