Label	Element	Value
Noncontrolling Interest, Period Increase (Decrease)	us-gaap_MinorityInterestPeriodIncreaseDecrease	$ (1,755,000)
Stock Issued During Period, Value, Employee Stock Ownership Plan	us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	2,094,000
Held-to-maturity, Transferred Securities, Amortization of Unrealized Gains, Net of Tax	sivb_HeldtomaturityTransferredSecuritiesAmortizationofUnrealizedGainsNetofTax	(1,058,000)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	16,929,000
Other Comprehensive Income Unrealized Holding Gain Loss On Securities And Reclassification Adjustment For Sale Of Securities Net Of Tax	sivb_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesAndReclassificationAdjustmentForSaleOfSecuritiesNetOfTax	(4,981,000)
Stock Options Exercised And Vesting Of Restricted Stock Awards Net Of Restricted Stock Cancellations And Forfeitures	sivb_StockOptionsExercisedAndVestingOfRestrictedStockAwardsNetOfRestrictedStockCancellationsAndForfeitures	6,743,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	567,000
Additional Paid-in Capital [Member]
Stock Issued During Period, Value, Employee Stock Ownership Plan	us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	2,094,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	16,929,000
Stock Options Exercised And Vesting Of Restricted Stock Awards Net Of Restricted Stock Cancellations And Forfeitures	sivb_StockOptionsExercisedAndVestingOfRestrictedStockAwardsNetOfRestrictedStockCancellationsAndForfeitures	6,743,000
AOCI Attributable to Parent [Member]
Held-to-maturity, Transferred Securities, Amortization of Unrealized Gains, Net of Tax	sivb_HeldtomaturityTransferredSecuritiesAmortizationofUnrealizedGainsNetofTax	(1,058,000)
Other Comprehensive Income Unrealized Holding Gain Loss On Securities And Reclassification Adjustment For Sale Of Securities Net Of Tax	sivb_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesAndReclassificationAdjustmentForSaleOfSecuritiesNetOfTax	(4,981,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	$ 567,000
Common Stock [Member]
Stock Issued During Period, Shares, Employee Stock Ownership Plan	us-gaap_StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	10,838
Stock Options Exercised And Vesting Of Restricted Stock Awards Net Of Restricted Stock Cancellations And Forfeitures Shares	sivb_StockOptionsExercisedAndVestingOfRestrictedStockAwardsNetOfRestrictedStockCancellationsAndForfeituresShares	162,797
Stock Options Exercised And Vesting Of Restricted Stock Awards Net Of Restricted Stock Cancellations And Forfeitures	sivb_StockOptionsExercisedAndVestingOfRestrictedStockAwardsNetOfRestrictedStockCancellationsAndForfeitures	$ 0
Retained Earnings [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	us-gaap_ProfitLoss	101,483,000
Noncontrolling Interest [Member]
Noncontrolling Interest, Period Increase (Decrease)	us-gaap_MinorityInterestPeriodIncreaseDecrease	(1,755,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	us-gaap_ProfitLoss	6,397,000
Parent [Member]
Stock Issued During Period, Value, Employee Stock Ownership Plan	us-gaap_StockIssuedDuringPeriodValueEmployeeStockOwnershipPlan	2,094,000
Held-to-maturity, Transferred Securities, Amortization of Unrealized Gains, Net of Tax	sivb_HeldtomaturityTransferredSecuritiesAmortizationofUnrealizedGainsNetofTax	(1,058,000)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition	us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	16,929,000
Other Comprehensive Income Unrealized Holding Gain Loss On Securities And Reclassification Adjustment For Sale Of Securities Net Of Tax	sivb_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesAndReclassificationAdjustmentForSaleOfSecuritiesNetOfTax	(4,981,000)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	us-gaap_ProfitLoss	101,483,000
Stock Options Exercised And Vesting Of Restricted Stock Awards Net Of Restricted Stock Cancellations And Forfeitures	sivb_StockOptionsExercisedAndVestingOfRestrictedStockAwardsNetOfRestrictedStockCancellationsAndForfeitures	6,743,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	$ 567,000