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Note Borrowings (Federal funds purchased and repurchase Agreements) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability $ 300,116 $ 390,921
Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 300,116 390,921
US Treasury Securities | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 272,252 279,373
US Treasury Securities | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 93,129 148,516
US Treasury Securities | After 30 to 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 19,831 87,357
US Treasury Securities | After 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 159,292 43,500
Obligations of U.S. Government sponsored entities | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 6,055 66,056
Obligations of U.S. Government sponsored entities | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 0 30,656
Obligations of U.S. Government sponsored entities | After 30 to 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 0 19,463
Obligations of U.S. Government sponsored entities | After 90 days | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 6,055 15,937
Mortgage Backed Securities | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 12,228 31,383
Mortgage Backed Securities | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 12,228 31,383
Collateralized Mortgage Obligations | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability 9,581 14,109
Collateralized Mortgage Obligations | Within 30 days | Secured Debt    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase liability $ 9,581 $ 14,109