Business Segment Information (Schedule Of Consolidated Revenue, Expenses, Tax And Assets) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Information [Line Items]
Net interest income	$ 176,340	$ 186,143	$ 521,955	$ 548,602
Provision for loan losses	32,000	50,000	34,000	225,000
Noninterest income	220,887	242,705	604,816	727,560
Noninterest expense	322,708	341,490	980,960	1,013,515
Income/(loss) before income taxes	42,519	37,358	111,811	37,647
Provision/(benefit) for income taxes	8,367	3,290	16,362	(14,546)
Income from continuing operations	34,152	34,068	95,449	52,193
Income/(loss) from discontinued operations, net of tax	4,828	(358)	9,369	(7,897)
Net income/(loss)	38,980	33,710	104,818	44,296
Average assets	24,778,116	25,757,640	24,622,862	25,639,935
Regional Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	140,603	142,220	411,523	412,708
Provision for loan losses	(22,698)	10,298	(48,850)	90,294
Noninterest income	67,952	71,970	201,805	215,206
Noninterest expense	137,300	152,173	428,454	455,895
Income/(loss) before income taxes	93,953	51,719	233,724	81,725
Provision/(benefit) for income taxes	34,739	18,822	85,955	29,380
Net income/(loss)	59,214	32,897	147,769	52,345
Average assets	11,432,091	11,462,479	11,188,037	11,326,546
Capital Markets [Member]
Segment Reporting Information [Line Items]
Net interest income	5,555	8,584	16,695	15,772
Noninterest income	99,505	114,055	267,510	329,615
Noninterest expense	77,163	79,434	254,099	241,376
Income/(loss) before income taxes	27,897	43,205	30,106	104,011
Provision/(benefit) for income taxes	10,659	16,214	11,361	38,980
Net income/(loss)	17,238	26,991	18,745	65,031
Average assets	2,343,696	2,347,810	2,215,467	2,103,658
Corporate [Member]
Segment Reporting Information [Line Items]
Net interest income	(463)	(2,845)	(288)	3,825
Noninterest income	38,058	7,943	59,936	37,775
Noninterest expense	19,013	19,413	75,973	51,735
Income/(loss) before income taxes	18,582	(14,315)	(16,325)	(10,135)
Provision/(benefit) for income taxes	666	(15,449)	(28,711)	(30,925)
Net income/(loss)	17,916	1,134	12,386	20,790
Average assets	5,123,288	4,980,852	5,106,530	4,826,606
Non-Strategic [Member]
Segment Reporting Information [Line Items]
Net interest income	30,645	38,184	94,025	116,297
Provision for loan losses	54,698	39,702	82,850	134,706
Noninterest income	15,372	48,737	75,565	144,964
Noninterest expense	89,232	90,470	222,434	264,509
Income/(loss) before income taxes	(97,913)	(43,251)	(135,694)	(137,954)
Provision/(benefit) for income taxes	(37,697)	(16,297)	(52,243)	(51,981)
Income from continuing operations	(60,216)	(26,954)	(83,451)	(85,973)
Income/(loss) from discontinued operations, net of tax	4,828	(358)	9,369	(7,897)
Net income/(loss)	(55,388)	(27,312)	(74,082)	(93,870)
Average assets	$ 5,879,041	$ 6,966,499	$ 6,112,828	$ 7,383,125