CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	Total	Additional Paid In Capital Preferred Stock	Common Stock	Additional Paid In Capital Common Stock	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss), Net of Tax	Comprehensive Income	Preferred stock, Series A, non-cumulative convertible Additional Paid In Capital Preferred Stock	Preferred stock, Series A, non-cumulative convertible Common Stock	Preferred stock, Series A, non-cumulative convertible Additional Paid In Capital Common Stock	Preferred stock, Series A, non-cumulative convertible Retained Earnings	Preferred stock, Series B, cumulative Additional Paid In Capital Preferred Stock	Preferred stock, Series B, cumulative Retained Earnings	Preferred stock, Series C, cumulative convertible Additional Paid In Capital Preferred Stock	Preferred stock, Series C, cumulative convertible Common Stock	Preferred stock, Series C, cumulative convertible Additional Paid In Capital Common Stock
BALANCE at Dec. 31, 2008	$ 1,550,766	$ 472,311	$ 70	$ 695,521	$ 580,282	$ (102,817)	$ (94,601)
Comprehensive income:
Net income	76,642				76,642			76,642
Net unrealized gain (loss) on investment securities available-for-sale, net of taxes (benefits) of ($13,007), ($4,028) and $52,749 and reclassification of ($12,084), $5,714, and ($63,730) net gain (loss) included in net income, for the year ended, December 31, 2011, 2010 and 2009 respectively	72,844						72,844	72,844
Net unrealized gain as a result of desecuritization, net of taxes of $22,124	30,552						30,552	30,552
Noncredit-related impairment loss on securities, net of taxes (benefits) of ($2,143), ($6,492) and ($5,935) for the year ended, December 31, 2011, 2010 and 2009 respectively	(8,196)						(8,196)	(8,196)
Total comprehensive income								171,842
Stock compensation costs	5,330			5,330
Tax benefit (provision) from stock compensation plans, net	(1,012)			(1,012)
Preferred stock issuance and conversion costs	(9,928)	(9,928)
Common stock issuance costs	(10,392)			(10,392)
Induced conversion of 110,764 shares of Series A preferred stock	(107,474)								(107,474)
Issuance of 1,024,925, 1,867,194 and 488,256 shares of common stock pursuant to various stock compensation plans and agreements, for the year ended, December 31, 2011, 2010 and 2009 respectively	949		1	948
Conversion of preferred stock into common stock	107,474									10	125,804	(18,340)
Issuance of 23,247,012 shares common stock from various private placements	192,454		24	192,430
Issuance of 12,650,000 shares common stock from public offering	80,328		12	80,316
Issuance of 27,831, 17,910 and 22,386 shares pursuant to Director retainer fee, for the year ended, December 31, 2011, 2010 and 2009 respectively	219			219
Issuance of 335,047 shares Series C preferred stock, net of stock issuance costs	335,047														335,047
Cancellation of 240,193, 343,029 and 76,962 shares of common stock due to forfeitures of issued restricted stock, for the year ended, December 31, 2011, 2010 and 2009 respectively				1,883		(1,883)
Purchase of 29,610, 65,834 and 37,020 shares of treasury stock due to the vesting of restricted stock, for the year ended, December 31, 2011, 2010 and 2009 respectively	(430)					(430)
Amortization of Series B preferred stock discount	(3,847)												3,847	(3,847)
Preferred stock dividends	(26,928)				(26,928)
Common stock dividends	(3,586)				(3,586)
BALANCE at Dec. 31, 2009	2,284,659	693,803	117	1,091,047	604,223	(105,130)	599
Comprehensive income:
Net income	164,564				164,564			164,564
Net unrealized gain (loss) on investment securities available-for-sale, net of taxes (benefits) of ($13,007), ($4,028) and $52,749 and reclassification of ($12,084), $5,714, and ($63,730) net gain (loss) included in net income, for the year ended, December 31, 2011, 2010 and 2009 respectively	(5,563)						(5,563)	(5,563)
Noncredit-related impairment loss on securities, net of taxes (benefits) of ($2,143), ($6,492) and ($5,935) for the year ended, December 31, 2011, 2010 and 2009 respectively	(8,966)						(8,966)	(8,966)
Foreign currency translation adjustments, net of taxes (benefits) of ($438) and $1,098 for the year ended, December 31, 2011 and 2010 respectively	1,516						1,516	1,516
Total comprehensive income								151,551
Stock compensation costs	8,480			8,480
Tax benefit (provision) from stock compensation plans, net	(170)			(170)
Issuance of 1,024,925, 1,867,194 and 488,256 shares of common stock pursuant to various stock compensation plans and agreements, for the year ended, December 31, 2011, 2010 and 2009 respectively	4,454		2	4,452
Conversion of preferred stock into common stock															(325,299)	37	325,262
Issuance of 27,831, 17,910 and 22,386 shares pursuant to Director retainer fee, for the year ended, December 31, 2011, 2010 and 2009 respectively	281			281
Cancellation of 240,193, 343,029 and 76,962 shares of common stock due to forfeitures of issued restricted stock, for the year ended, December 31, 2011, 2010 and 2009 respectively				4,925		(4,925)
Purchase of 29,610, 65,834 and 37,020 shares of treasury stock due to the vesting of restricted stock, for the year ended, December 31, 2011, 2010 and 2009 respectively	(1,207)					(1,207)
Amortization of Series B preferred stock discount	(21,042)												21,042	(21,042)
Preferred stock dividends	(22,084)				(22,084)
Common stock dividends	(5,545)				(5,545)
Repurchase of 1,517,555 common stock warrants for the year ended, December 31, 2011 and 306,546 shares of Series B preferred stock for the year ended, December 31, 2010	(306,488)												(306,488)
BALANCE at Dec. 31, 2010	2,113,931	83,058	156	1,434,277	720,116	(111,262)	(12,414)
Comprehensive income:
Net income	245,234				245,234			245,234
Net unrealized gain (loss) on investment securities available-for-sale, net of taxes (benefits) of ($13,007), ($4,028) and $52,749 and reclassification of ($12,084), $5,714, and ($63,730) net gain (loss) included in net income, for the year ended, December 31, 2011, 2010 and 2009 respectively	(17,961)						(17,961)	(17,961)
Noncredit-related impairment loss on securities, net of taxes (benefits) of ($2,143), ($6,492) and ($5,935) for the year ended, December 31, 2011, 2010 and 2009 respectively	(2,960)						(2,960)	(2,960)
Foreign currency translation adjustments, net of taxes (benefits) of ($438) and $1,098 for the year ended, December 31, 2011 and 2010 respectively	(605)						(605)	(605)
Total comprehensive income								223,708
Stock compensation costs	13,543			13,543
Tax benefit (provision) from stock compensation plans, net	717			717
Issuance of 1,024,925, 1,867,194 and 488,256 shares of common stock pursuant to various stock compensation plans and agreements, for the year ended, December 31, 2011, 2010 and 2009 respectively	5,206		1	5,205
Conversion of preferred stock into common stock									(31)		31
Issuance of 27,831, 17,910 and 22,386 shares pursuant to Director retainer fee, for the year ended, December 31, 2011, 2010 and 2009 respectively	520			520
Cancellation of 240,193, 343,029 and 76,962 shares of common stock due to forfeitures of issued restricted stock, for the year ended, December 31, 2011, 2010 and 2009 respectively				4,090		(4,090)
Purchase of 29,610, 65,834 and 37,020 shares of treasury stock due to the vesting of restricted stock, for the year ended, December 31, 2011, 2010 and 2009 respectively	(649)					(649)
Preferred stock dividends	(6,857)				(6,857)
Common stock dividends	(23,876)				(23,876)
Repurchase of 1,517,555 common stock warrants for the year ended, December 31, 2011 and 306,546 shares of Series B preferred stock for the year ended, December 31, 2010	(14,500)			(14,500)
BALANCE at Dec. 31, 2011	$ 2,311,743	$ 83,027	$ 157	$ 1,443,883	$ 934,617	$ (116,001)	$ (33,940)