Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest income:
Interest and fees on loans	$ 442,366	$ 473,162	$ 1,356,107	$ 1,427,882
Interest on money market investments	6,175	5,349	17,378	15,076
Interest on securities:
Held-to-maturity	7,739	8,337	23,559	26,621
Available-for-sale	16,917	22,042	53,657	70,290
Trading account	210	110	687	596
Total interest income	473,407	509,000	1,451,388	1,540,465
Interest expense:
Interest on deposits	14,506	19,049	45,291	63,285
Interest on short-term borrowings	71	193	241	1,228
Interest on long-term debt	43,309	51,597	141,563	173,969
Total interest expense	57,886	70,839	187,095	238,482
Net interest income	415,521	438,161	1,264,293	1,301,983
Provision for loan losses	(5,573)	(1,889)	(56,598)	24,628
Net interest income after provision for loan losses	421,094	440,050	1,320,891	1,277,355
Noninterest income:
Service charges and fees on deposit accounts	44,701	44,951	132,610	131,909
Other service charges, commissions and fees	45,977	44,679	134,596	127,923
Trust and wealth management income	7,120	6,521	21,846	20,952
Capital markets and foreign exchange	7,309	6,026	21,535	19,102
Dividends and other investment income	12,101	11,686	36,164	42,708
Loan sales and servicing income	8,464	10,695	30,138	29,334
Fair value and nonhedge derivative loss	(4,403)	(5,820)	(12,805)	(17,004)
Equity securities gains, net	3,165	2,683	8,206	11,935
Fixed income securities gains, net	1,580	3,046	3,726	9,285
Impairment losses on investment securities:
Impairment losses on investment securities	(10,470)	(3,876)	(46,873)	(46,175)
Non-credit losses on secutities not expectd to be sold (recognized in other comprehensive income	1,403	1,140	23,472	25,922
Net impairment losses on investment securities	(9,067)	(2,736)	(23,401)	(20,253)
Other noninterest income	5,243	3,495	15,942	9,820
Total noninterest income	122,190	125,226	368,557	365,711
Noninterest expense:
Salaries and employee benefits	229,185	220,223	686,302	665,622
Occupancy, net	28,230	28,601	83,570	84,721
Equipment, software and furniture	26,560	27,122	79,179	81,216
Other real estate expense	(831)	207	2,736	14,457
Credit-related expense	7,265	13,316	27,144	39,216
Provision for unfunded lending commitments	(19,935)	2,264	(22,662)	3,428
Professional and legal services	16,462	12,749	44,082	36,792
Advertising	6,091	7,326	17,791	19,751
FDIC premiums	9,395	11,278	29,230	32,641
Amortization of core deposit and other intangibles	3,570	4,241	11,151	12,794
Debt Extinguishment Cost	0	0	40,282	0
Other	64,671	67,648	220,884	198,365
Total noninterest expense	370,663	394,975	1,219,689	1,189,003
Income before income taxes	172,621	170,301	469,759	454,063
Income taxes	61,107	60,704	164,832	163,599
Net income	111,514	109,597	304,927	290,464
Net loss applicable to noncontrolling interests	0	(254)	(336)	(800)
Net income applicable to controlling interest	111,514	109,851	305,263	291,264
Preferred stock dividends	(27,507)	(47,529)	(77,547)	(148,238)
Preferred Stock Redemption	125,700	0	125,700	0
Net earnings applicable to common shareholders	209,707	62,322	353,416	143,026
Weighted average common shares outstanding during the period:
Basic shares	184,112	183,237	183,721	183,008
Diluted shares	184,742	183,383	184,144	183,162
Net earnings per common share:
Basic	$ 1.13	$ 0.34	$ 1.90	$ 0.77
Diluted	$ 1.12	$ 0.34	$ 1.90	$ 0.77
Retained Earnings [Member]
Noninterest expense:
Net income			$ 305,263	$ 291,264