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Cash and Cash Equivalents Securities Purchased Under Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Disclosure Securities Purchased Under Agreements [Abstract]    
Average securities purchased under agreements to resell $ 108,910sivb_SecuritiesPurchasedUnderAgreementToResellAverageBalanceDuringPeriod $ 96,309sivb_SecuritiesPurchasedUnderAgreementToResellAverageBalanceDuringPeriod
Maximum amount outstanding at any month-end during the year $ 283,215sivb_SecuritiesPurchasedUnderAgreementToResellMaximumMonthEndBalanceDuringPeriod $ 338,687sivb_SecuritiesPurchasedUnderAgreementToResellMaximumMonthEndBalanceDuringPeriod