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Cash and Cash Equivalents (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash and Cash Equivalents [Abstract]        
Cash and due from banks $ 1,694,329us-gaap_CashAndDueFromBanks [1] $ 1,349,688us-gaap_CashAndDueFromBanks [1]    
Securities purchased under agreements to resell 95,611us-gaap_SecuritiesPurchasedUnderAgreementsToResell [2] 172,989us-gaap_SecuritiesPurchasedUnderAgreementsToResell [2]    
Other short-term investment securities 6,122us-gaap_OtherShortTermInvestments 16,102us-gaap_OtherShortTermInvestments    
Total cash and cash equivalents $ 1,796,062us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,538,779us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,008,983us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,114,948us-gaap_CashAndCashEquivalentsAtCarryingValue
[1] At December 31, 2014 and 2013, $861 million and $715 million, respectively, of our cash and due from banks was deposited at the FRB and was earning interest at the Federal Funds target rate, and interest-earning deposits in other financial institutions were $440 million and $300 million, respectively.
[2] At December 31, 2014 and 2013, securities purchased under agreements to resell were collateralized by U.S. Treasury securities and U.S. agency securities with aggregate fair values of $98 million and $176 million, respectively. None of these securities were sold or repledged as of December 31, 2014 and 2013.