Net Trading (Schedule Of Net Trading) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Trading [Abstract]
Net realized gains (losses) - trading inventory	$ 10,443	$ 6,295
Net unrealized gains (losses) - trading inventory	(440)	559
Net gains and losses	10,003	6,854
Interest income-trading inventory	2,477	1,615
Interest income - residential transition loans		15
Interest income-receivables under resale agreements	41,485	37,483
Interest income	43,962	39,113
Interest expense-securities sold under agreements to repurchase	(34,766)	(36,381)
Interest expense-Legacy Texas Credit Facility	(39)	(5)
Interest expense-margin payable	(599)	(857)
Interest expense	(35,404)	(37,243)
Net Trading	$ 18,561	$ 8,724