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Note Borrowings (Composition of federal funds purchased and assets sold under agreements to repurchase) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Federal Funds Purchased and Securities Sold under Agreements to Repurchase    
Federal Funds Purchased $ 0 $ 50,000
Assets sold under agreements to repurchase 479,425 712,145
Federal Funds Purchased and Securities Sold Under Agreements To Repurchase $ 479,425 $ 762,145