Parent Company Financial Statements (Schedule Of Condensed Statements Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 74,496	$ 28,326	$ (153,366)
Gain on sale of investment securities, net	(7,735)	(2,326)	(8,896)
Depreciation, amortization and accretion	(13,151)	(9,199)	(11,649)
Change in fair value of junior subordinated debentures	2,217	(4,978)	(6,854)
Net (increase) decrease in other assets	(17,798)	47,011	(72,570)
Net increase (decrease) in other liabilities	15,177	2,914	(8,426)
Net cash provided by operating activities	182,352	198,649	93,226
Net cash used by investing activities	(382,744)	(556,431)	(449,187)
Proceeds from issuance of preferred stock		198,289
Redemption of preferred stock		(214,181)
Repurchase of warrants issued to U.S. Treasury		(4,500)
Net proceeds from issuance of common stock		89,786	245,697
Dividends paid on preferred stock		(3,686)	(10,739)
Dividends paid on common stock	(25,317)	(20,626)	(13,399)
Proceeds from exercise of stock options	308	1,004	301
Net cash (used) provided by financing activities	(204,967)	756,494	756,698
Change in cash and cash equivalents	(405,359)	398,712	400,737
Cash and cash equivalents, beginning of year	1,004,125	605,413	204,676
Cash and cash equivalents, end of year	598,766	1,004,125	605,413
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	74,496	28,326	(153,366)
(Distributions in excess) equity in undistributed earnings of subsidiaries	(64,096)	(30,813)	169,621
Gain on sale of investment securities, net			(79)
Depreciation, amortization and accretion	(322)	(322)	(467)
Change in fair value of junior subordinated debentures	2,217	(4,978)	(6,854)
Net (increase) decrease in other assets	(3,933)	3,717	(637)
Net increase (decrease) in other liabilities	3,736	(1,930)	1,523
Net cash provided by operating activities	12,098	(6,000)	9,741
Investment in subsidiaries	(3,668)	(126,500)	(87,000)
Proceeds from investment securities held to maturity			229
Net decrease (increase) in receivables from nonbank subsidiaries	8	(8)
Net cash used by investing activities	(3,660)	(126,508)	(86,771)
Net increase (decrease) in payables to subsidiaries	7	(34)	53
Proceeds from issuance of preferred stock		198,289
Redemption of preferred stock		(214,181)
Repurchase of warrants issued to U.S. Treasury		(4,500)
Net proceeds from issuance of common stock		89,786	245,697
Dividends paid on preferred stock		(3,686)	(10,739)
Dividends paid on common stock	(25,317)	(20,626)	(13,399)
Stock repurchased	(29,754)	(284)	(174)
Proceeds from exercise of stock options	309	1,004	301
Net cash (used) provided by financing activities	(54,755)	45,768	221,739
Change in cash and cash equivalents	(46,317)	(86,740)	144,709
Cash and cash equivalents, beginning of year	128,450	215,190	70,481
Cash and cash equivalents, end of year	$ 82,133	$ 128,450	$ 215,190