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Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock Average Required Reserve Balances (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock [Abstract]    
Average required reserve balances at FRB San Francisco $ 168,387sivb_FederalReserveBankWithAverageReserveRequired $ 131,374sivb_FederalReserveBankWithAverageReserveRequired