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Cash and Cash Equivalents (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Cash and Cash Equivalents [Abstract]    
Cash and due from banks $ 1,533,270 $ 1,372,743
Securities purchased under agreements to resell 316,059 125,391
Other short-term investment securities 5,128 5,123
Total cash and cash equivalents $ 1,854,457 $ 1,503,257