Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interest income:
Mortgage securities and similar investments	$ 62,890	$ 40,614	$ 179,167	$ 148,398
Other	59	111	230	338
Interest income	62,949	40,725	179,397	148,736
Interest expense:
Repurchase arrangements and similar borrowings	(15,744)	(11,096)	(41,772)	(35,610)
Unsecured borrowings	(2,186)	(2,186)	(6,560)	(6,560)
Other			(5)
Interest expense	(17,930)	(13,282)	(48,337)	(42,170)
Net interest income (expense)	45,019	27,443	131,060	106,566
Other revenue (expense):
Miscellaneous other revenue (expense)	(109)	(427)	(926)	(730)
Incentive compensation	(1,429)	(983)	(4,149)	(3,728)
Salaries and benefits	(1,631)	(1,425)	(5,004)	(4,531)
Other general and administrative expense	(911)	(999)	(2,939)	(3,902)
Operating expenses	(4,080)	(3,834)	(13,018)	(12,891)
Income before equity in earnings of unconsolidated affiliates	40,939	23,609	118,042	93,675
Equity in earnings of unconsolidated affiliates	64	64	194	194
Net income	41,003	23,673	118,236	93,869
Net income available to common stockholders:
Net income	41,003	23,673	118,236	93,869
Less cash dividends paid on preferred shares	(5,105)	(5,058)	(15,223)	(15,175)
Net income (loss) available to common stockholders, basic, total	$ 35,898	$ 18,615	$ 103,013	$ 78,694
Net income per common share:
Basic	$ 0.43	$ 0.27	$ 1.33	$ 1.13
Diluted	$ 0.43	$ 0.27	$ 1.32	$ 1.12
Cash dividends declared per share:
Common	$ 0.440	$ 0.260	$ 1.330	$ 1.120
Series A Preferred	$ 0.400	$ 0.400	$ 1.200	$ 1.200
Series B Preferred	$ 0.315	$ 0.315	$ 0.945	$ 0.945