CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
U.S. Treasury Securities, pledged assets	$ 476,863	$ 660,823	[1]
Agency Mortgage-Backed Securities, pledged assets	82,193,414	67,787,023	[1]
Agency debentures, pledged assets	$ 459,283	$ 1,068,869	[1]
Common Stock, par value	$ 0.01	$ 0.01	[1]
Common stock, shares authorized	1,987,987,500
Common Stock, shares issued	831,047,443	631,594,205	[1]
Common Stock, shares outstanding	831,047,443	631,594,205	[1]
Series B Cumulative Convertible Redeemable Preferred Stock [Member]
Preferred Stock, shares authorized	4,600,000	4,600,000	[1]
Preferred Stock, shares issued	1,649,047	1,652,047	[1]
Preferred Stock, shares outstanding	1,649,047	1,652,047	[1]
Series A Cumulative Redeemable Preferred Stock [Member]
Preferred Stock, shares authorized	7,412,500	7,412,500	[1]
Preferred Stock, shares issued	7,412,500	7,412,500	[1]
Preferred Stock, shares outstanding	7,412,500	7,412,500	[1]

[1] Derived from the audited consolidated financial statements at December 31, 2010.