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Loans and Allowance for Loan Losses - Composition of Loans, Net of Unearned income (Additional Information) (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income $ 14,439,574,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome [1] $ 14,384,276,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome [1]
Credit Card Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loan portfolio 154,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CreditCardReceivablesMember		 131,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CreditCardReceivablesMember
Real estate secured loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 1,209,153,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_RealEstateSecuredConsumerLoansMember		 1,118,115,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_RealEstateSecuredConsumerLoansMember
Real estate secured loans | Loans for personal residence    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 1,001,125,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sivb_LoansForPersonalResidenceMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_RealEstateSecuredConsumerLoansMember		 918,629,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sivb_LoansForPersonalResidenceMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_RealEstateSecuredConsumerLoansMember
Real estate secured loans | Loans to eligible employees    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 139,761,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sivb_LoansToEligibleEmployeesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_RealEstateSecuredConsumerLoansMember		 133,568,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= sivb_LoansToEligibleEmployeesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_RealEstateSecuredConsumerLoansMember
Real estate secured loans | Home equity lines of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 68,267,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_RealEstateSecuredConsumerLoansMember		 65,918,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_RealEstateSecuredConsumerLoansMember
Premium wine    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross construction loans 108,000,000us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_PremiumWineFinancingReceivableMember		 112,000,000us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_PremiumWineFinancingReceivableMember
Loans, net of unearned income $ 799,184,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_PremiumWineFinancingReceivableMember		 $ 794,321,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sivb_PremiumWineFinancingReceivableMember
[1] Included within our total loan portfolio are credit card loans of $154 million and $131 million at March 31, 2015 and December 31, 2014, respectively.