Fair Value of Financial Instruments (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Change in fair value of financial instruments
Change in fair value of financial instruments, assets			$ 12,253
Change in fair value of financial instruments, liabilities			113,262
Change in fair value of financial instruments	(11,169)	(25,727)	(120,092)	(20,116)
Trading securities and security-related receivables [Member]
Change in fair value of financial instruments
Change in fair value of financial instruments, assets	11,712	2,081	17,844	18,635
CDO notes payable, trust preferred obligations and other liabilities [Member]
Change in fair value of financial instruments
Change in fair value of financial instruments, liabilities	(11,524)	(6,831)	(119,828)	(13,862)
Derivatives [Member]
Change in fair value of financial instruments
Change in fair value of financial instruments, liabilities	$ (11,357)	$ (20,977)	$ (18,108)	$ (24,889)

Amount of increase (decrease) of assets measured at fair value on a recurring basis using unobservable inputs (level 3). Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issues, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

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Amount of increase (decrease) of liabilities measured at fair value on a recurring basis using unobservable inputs (level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issues, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

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