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Net Trading (Schedule Of Net Trading) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net Trading [Abstract]        
Net realized gains (losses) - trading inventory $ 1,627 $ 4,609 $ 9,420 $ 15,060
Net unrealized gains (losses) - trading inventory 3,302 181 5,503 1,562
Net Gains and losses 4,929 4,790 14,923 16,622
Interest income-trading inventory 1,144 364 3,373 1,533
Interest income-receivables under resale agreements 18,160 3,543 38,720 8,018
Interest income 19,304 3,907 42,093 9,551
Interest expense-securities sold under agreements to repurchase (16,894) (2,500) (35,493) (5,497)
Interest expense-margin payable (523) (209) (1,330) (518)
Interest expense (17,417) (2,709) (36,823) (6,015)
Net Trading $ 6,816 $ 5,988 $ 20,193 $ 20,158