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Collateralized Securities Transactions (Schedule Of Repurchase Agreements Accounted For As Secured Borrowings) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Assets Sold under Agreements to Repurchase [Line Items]    
Securities sold under agreements to repurchase $ 4,506,628 $ 1,692,279
Receivables under resale agreements 4,464,324 1,680,883
Repurchase Agreements [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 7,357,920 2,066,599
Reverse repurchase agreements with FICC netted with repurchase agreements with FICC (2,851,292) (374,320)
Securities sold under agreements to repurchase 4,506,628 1,692,279
Repurchase Agreements [Member] | Overnight and Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 5,956,755 1,179,484
Repurchase Agreements [Member] | Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 121,721 887,115
Repurchase Agreements [Member] | 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 252,126  
Repurchase Agreements [Member] | Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 1,027,318  
Repurchase Agreements [Member] | U.S. government agency MBS [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 6,991,827 1,650,067
Repurchase Agreements [Member] | U.S. government agency MBS [Member] | Overnight and Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 5,936,630 1,174,637
Repurchase Agreements [Member] | U.S. government agency MBS [Member] | Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 27,879 475,430
Repurchase Agreements [Member] | U.S. government agency MBS [Member] | Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 1,027,318  
Repurchase Agreements [Member] | MBS (Gestational Repo) [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 345,968 411,685
Repurchase Agreements [Member] | MBS (Gestational Repo) [Member] | Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 93,842 411,685
Repurchase Agreements [Member] | MBS (Gestational Repo) [Member] | 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 252,126  
Repurchase Agreements [Member] | SBA loans [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 20,125 4,847
Repurchase Agreements [Member] | SBA loans [Member] | Overnight and Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized liabilities for repurchase agreements 20,125 4,847
Reverse Repurchase Agreements [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 7,315,616 2,055,203
Reverse repurchase agreements with FICC netted with repurchase agreements with FICC (2,851,292) (374,320)
Receivables under resale agreements 4,464,324 1,680,883
Reverse Repurchase Agreements [Member] | Overnight and Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 1,502,941 25,004
Reverse Repurchase Agreements [Member] | Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 3,688,416 926,391
Reverse Repurchase Agreements [Member] | 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 1,099,644 750,018
Reverse Repurchase Agreements [Member] | Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 1,024,615 353,790
Reverse Repurchase Agreements [Member] | U.S. government agency MBS [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 6,970,712 1,643,592
Reverse Repurchase Agreements [Member] | U.S. government agency MBS [Member] | Overnight and Continuous [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 1,502,941 25,004
Reverse Repurchase Agreements [Member] | U.S. government agency MBS [Member] | Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 3,595,560 514,780
Reverse Repurchase Agreements [Member] | U.S. government agency MBS [Member] | 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 847,596 750,018
Reverse Repurchase Agreements [Member] | U.S. government agency MBS [Member] | Greater than 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 1,024,615 353,790
Reverse Repurchase Agreements [Member] | MBS (Gestational Repo) [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 344,904 411,611
Reverse Repurchase Agreements [Member] | MBS (Gestational Repo) [Member] | Up to 30 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements 92,856 $ 411,611
Reverse Repurchase Agreements [Member] | MBS (Gestational Repo) [Member] | 30 to 90 Days [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Gross amount of recognized assets for reverse repurchase agreements $ 252,048