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Financial Instruments (Schedule Of Trading Securities Sold, Not Yet Purchased) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased $ 53,332 $ 44,167
U.S. government agency MBS [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 740 [1] 13 [1]
U.S. Treasury securities [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 33,265 19,722
Corporate bonds and redeemable preferred stock [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 12,361 21,976
RMBS [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 35  
SBA loans [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 437  
Foreign government bonds [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 8  
Municipal bonds [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 120 128
Certificates of deposit [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased 6,366 2,325
Equity securities [Member]
    
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]    
Trading securities sold, not yet purchased   $ 3
[1] Represents TBAs. See note 8.