Quarterly Financial Information (Financial Information By Quarter) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Gross interest income	$ 490,017	$ 473,407	$ 493,233	$ 484,748	$ 498,257	$ 509,000	$ 512,588	$ 518,877	$ 1,941,405	$ 2,038,722	$ 2,188,581
Net interest income	432,035	415,521	430,657	418,115	429,957	438,161	426,344	437,478	1,696,328	1,731,940	1,756,185
Provision for loan losses	(30,538)	(5,573)	(21,990)	(29,035)	(10,401)	(1,889)	10,853	15,664	(87,136)	14,227	74,532
Net impairment losses on investment securities	(141,733)	(9,067)	(4,217)	(10,117)	83,808	2,736	7,308	10,209	(165,134)	(104,061)	(33,683)
Investment securities gains (losses), net	(6,310)	4,745	1,056	6,131	9,577	5,729	5,626	9,865	5,622	30,797
Other noninterest income	116,893	126,512	128,309	125,205	128,390	122,233	130,347	112,164	496,919	493,134
Noninterest expense	494,750	370,663	451,678	397,348	407,014	394,975	401,656	392,372	1,714,439	1,596,017	1,658,564
Income before income taxes	(63,327)	172,621	126,117	171,021	87,503	170,301	142,500	141,262	406,432	541,566	521,273
Net income (loss)	(41,472)	111,514	83,026	110,387	57,686	109,597	91,464	89,403	263,455	348,150	322,690
Net income (loss) applicable to controlling interest					58,252	109,851	91,737	89,676	263,791	349,516	323,804
Net income (loss) applicable to controlling interest	(41,472)	111,514	83,026	110,723					263,791	349,516	323,804
Preferred stock dividends	17,965	27,507	27,641	22,399	22,647	47,529	36,522	64,187	(95,512)	(170,885)	(170,414)
Preferred stock redemption	125,700	0	0	0					125,700	0	0
Net earnings applicable to common shareholders	$ (59,437)	$ 209,707	$ 55,385	$ 88,324	$ 35,605	$ 62,322	$ 55,215	$ 25,489	$ 293,979	$ 178,631	$ 153,390
Basic, per share	$ (0.32)	$ 1.13	$ 0.30	$ 0.48	$ 0.19	$ 0.34	$ 0.30	$ 0.14	$ 1.58	$ 0.97	$ 0.83
Diluted	$ (0.32)	$ 1.12	$ 0.30	$ 0.48	$ 0.19	$ 0.34	$ 0.30	$ 0.14	$ 1.58	$ 0.97	$ 0.83