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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Debt Disclosure [Line Items]    
Investments transferred out of Level 3 $ 243us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 $ 16,710us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
Fair value accounting | Non-marketable securities    
Debt Disclosure [Line Items]    
Investments transferred out of Level 3 $ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ invest_InvestmentAxis
= sivb_NonmarketableSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= sivb_FairValueAccountingMember		 [1] $ 16,033us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ invest_InvestmentAxis
= sivb_NonmarketableSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= sivb_FairValueAccountingMember		 [1]
[1] Realized and unrealized gains (losses) are recorded in the line items “gains on investment securities, net”, and “other noninterest income”, components of noninterest income.