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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

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