Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net income	$ 39,812	$ 29,472	$ 17,581
Other comprehensive (loss) income:
Change in market value of available-for-sale securities	11,408	4,603	13,173
Reclassification adjustment for gain on sale of available-for-sale securities	(2,096)	(779)	(171)
Net unrealized (loss) gain on cash flow hedging instruments	(22,624)	(3,828)	1,008
Other comprehensive (loss) income	(13,312)	(4)	14,010
Comprehensive income	26,500	29,468	31,591
Dividends declared on preferred stock	0	(3,061)	(4,010)
Comprehensive income to common shareholders	$ 26,500	$ 26,407	$ 27,581