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Composition of federal funds purchased and assets sold under agreements to repurchase (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets Sold under Agreements to Repurchase [Line Items]    
Federal Funds Purchased $ 250,000 $ 0
Assets sold under agreements to repurchase 1,824,676 1,659,292
Federal Funds Purchased and Securities Sold Under Agreements To Repurchase $ 2,074,676 $ 1,659,292