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Note Borrowings (Composition of federal funds purchased and assets sold under agreements to repurchase) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Federal Funds Purchased and Securities Sold under Agreements to Repurchase    
Assets sold under agreements to repurchase $ 281,529 $ 390,921
Federal Funds Purchased and Securities Sold Under Agreements To Repurchase $ 281,529 $ 390,921