Consolidated Statements Of Changes In Shareholders' Equity (USD $)	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Total
BALANCE, VALUE at Dec. 31, 2008	$ 202,178,000	$ 1,005,820,000	$ 264,938,000	$ 14,072,000	$ 1,487,008,000
BALANCE, SHARES at Dec. 31, 2008		60,146,400
Net income (loss)			(153,366,000)		(153,366,000)
Other comprehensive income, net of tax				10,883,000	10,883,000
Comprehensive income (loss)					(142,483,000)
Issuance of common stock, shares		26,538,461
Issuance of common stock, value		245,697,000			245,697,000
Stock-based compensation		2,188,000			2,188,000
Stock repurchased and retired, shares		(19,516)
Stock repurchased and retired, value		(174,000)			(174,000)
Issuances of common stock under stock plans and related net tax benefit (deficiencies), shares		120,243
Issuances of common stock under stock plans and related net tax benefit (deficiencies), value		(243,000)			(243,000)
Amortization of discount on preferred stock	2,157,000		(2,157,000)
Dividends declared on preferred stock			(10,739,000)		(10,739,000)
Cash dividends on common stock			(14,737,000)		(14,737,000)
BALANCE, VALUE at Dec. 31, 2009	204,335,000	1,253,288,000	83,939,000	24,955,000	1,566,517,000
BALANCE, SHARES at Dec. 31, 2009		86,785,588
Net income (loss)			28,326,000		28,326,000
Other comprehensive income, net of tax				(10,000)	(10,000)
Comprehensive income (loss)					28,316,000
Issuance of common stock, shares		8,625,000
Issuance of common stock, value		89,786,000			89,786,000
Stock-based compensation		3,505,000			3,505,000
Stock repurchased and retired, shares		(22,541)
Stock repurchased and retired, value		(284,000)			(284,000)
Issuances of common stock under stock plans and related net tax benefit (deficiencies), shares		173,767
Issuances of common stock under stock plans and related net tax benefit (deficiencies), value		844,000			844,000
Redemption of preferred stock issued to U.S. Treasury	(214,181,000)				(214,181,000)
Issuance of preferred stock	198,289,000				198,289,000
Conversion of preferred stock to common stock, shares		18,975,000
Conversion of preferred stock to common stock, value	(198,289,000)	198,289,000
Amortization of discount on preferred stock	9,846,000		(9,846,000)
Dividends declared on preferred stock			(3,686,000)		(3,686,000)
Repurchase of warrants issued to U.S. Treasury		(4,500,000)			(4,500,000)
Cash dividends on common stock			(22,032,000)		(22,032,000)
BALANCE, VALUE at Dec. 31, 2010		1,540,928,000	76,701,000	24,945,000	1,642,574,000
BALANCE, SHARES at Dec. 31, 2010		114,536,814			114,536,814
Net income (loss)			74,496,000		74,496,000
Other comprehensive income, net of tax				8,829,000	8,829,000
Comprehensive income (loss)					83,325,000
Stock-based compensation		3,785,000			3,785,000
Stock repurchased and retired, shares		(2,557,056)
Stock repurchased and retired, value		(29,754,000)			(29,754,000)
Issuances of common stock under stock plans and related net tax benefit (deficiencies), shares		185,133
Issuances of common stock under stock plans and related net tax benefit (deficiencies), value		(46,000)			(46,000)
Cash dividends on common stock			(27,471,000)		(27,471,000)
BALANCE, VALUE at Dec. 31, 2011		$ 1,514,913,000	$ 123,726,000	$ 33,774,000	$ 1,672,413,000
BALANCE, SHARES at Dec. 31, 2011		112,164,891			112,164,891