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Collateralized Securities Transactions (Schedule Of Repurchase Agreements Accounted For As Secured Borrowings) (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Assets Sold under Agreements to Repurchase [Line Items]  
Gross amount of recognized liabilities for repurchase agreements $ 127,913
Overnight and Continuous [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Gross amount of recognized liabilities for repurchase agreements
Up to 30 Days [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Gross amount of recognized liabilities for repurchase agreements $ 127,913
30 to 90 Days [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Gross amount of recognized liabilities for repurchase agreements
Greater than 90 Days [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Gross amount of recognized liabilities for repurchase agreements
U.S. Government Agency MBS [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Gross amount of recognized liabilities for repurchase agreements $ 127,913
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
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 $ 127,913
U.S. Government Agency MBS [Member] | 30 to 90 Days [Member]  
Assets Sold under Agreements to Repurchase [Line Items]  
Gross amount of recognized liabilities for repurchase agreements
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