Investment Securities - Summary of Unrealized Losses on Available for Sale Securities (Parenthetical) (Detail)	Mar. 31, 2014 Investment
Investments, Debt and Equity Securities [Abstract]
Number of investments in unrealized loss positions	245
Number of investment with unrealized losses	11

Number of Securities, Continuous Unrealized Loss Position More Than Twelve Months

No definition available.

Name:	sivb_NumberOfSecuritiesContinuousUnrealizedLossPositionMoreThanTwelveMonths
Namespace Prefix:	sivb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant