Segment Reporting - Additional Information (Detail) (Global Commercial Bank, USD $) In Millions	6 Months Ended
Jun. 30, 2010
Global Commercial Bank
Segment Reporting Disclosure [Line Items]
Certain changes to the items reported, effect on income before income tax expense	$ 17.6

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sivb_SegmentReportingChangeInMeasurementMethodsAmount

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sivb

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xbrli:monetaryItemType

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na

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duration