Cash and Cash Equivalents Securities Purchased Under Agreements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Disclosure Securities Purchased Under Agreements [Abstract]
Average securities purchased under agreements to resell	$ 96,309	$ 131,287
Maximum amount outstanding at any month-end during the year	$ 338,687	$ 266,534

Securities Purchased Under Agreement to Resell, Maximum Month End Balance During Period

No definition available.

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Namespace Prefix:	sivb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration