Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Interest income:
Interest and fees on loans	$ 478,569	$ 523,741	$ 965,184	$ 1,041,898
Interest on money market investments	5,099	3,199	9,727	6,042
Interest on securities:
Held-to-maturity	9,325	9,009	18,284	17,673
Available-for-sale	25,090	22,179	48,248	44,455
Trading account	148	538	486	990
Total interest income	518,231	558,666	1,041,929	1,111,058
Interest expense:
Interest on deposits	20,823	34,257	44,236	70,741
Interest on short-term borrowings	256	1,783	1,035	3,963
Interest on long-term debt	65,165	106,454	122,372	196,326
Total interest expense	86,244	142,494	167,643	271,030
Net interest income	431,987	416,172	874,286	840,028
Provision for loan losses	10,853	1,330	26,517	61,330
Net interest income after provision for loan losses	421,134	414,842	847,769	778,698
Noninterest income:
Service charges and fees on deposit accounts	43,426	42,878	86,958	87,408
Other service charges, commissions and fees	38,554	43,958	72,780	85,643
Trust and wealth management income	8,057	7,179	14,431	13,933
Capital markets and foreign exchange	7,342	8,358	13,076	15,572
Dividends and other investment income	21,542	17,239	31,022	25,267
Loan sales and servicing income	10,287	9,836	18,639	15,849
Fair value and nonhedge derivative income (loss)	(6,784)	4,195	(11,184)	5,415
Equity securities gains, net	107	(1,636)	9,252	(739)
Fixed income securities gains (losses), net	5,519	(2,396)	6,239	(2,455)
Impairment losses on investment securities:
Impairment losses on investment securities	(24,026)	(6,339)	(42,299)	(9,444)
Noncredit-related losses on securities not expected to be sold (recognized in other comprehensive income)	16,718	1,181	24,782	1,181
Net impairment losses on investment securities	(7,308)	(5,158)	(17,517)	(8,263)
Other	2,280	3,896	6,325	24,862
Total noninterest income	123,022	128,349	230,021	262,492
Noninterest expense:
Salaries and employee benefits	220,765	222,138	445,399	437,148
Occupancy, net	28,169	27,588	56,120	55,598
Furniture and equipment	27,302	26,153	54,094	51,815
Other real estate expense	6,440	17,903	14,250	42,070
Credit-related expense	12,415	17,124	25,900	32,037
Provision for unfunded lending commitments	4,868	(1,904)	1,164	(11,444)
Legal and professional services	12,947	8,432	24,043	15,121
Advertising	6,618	5,962	12,425	12,873
FDIC premiums	10,444	15,232	21,363	39,333
Amortization of core deposit and other intangibles	4,262	4,855	8,553	10,556
Other	67,426	72,773	130,717	139,524
Total noninterest expense	401,656	416,256	794,028	824,631
Income before income taxes	142,500	126,935	283,762	216,559
Income taxes	51,036	54,325	102,895	91,358
Net income	91,464	72,610	180,867	125,201
Net loss applicable to noncontrolling interests	(273)	(265)	(546)	(491)
Net income applicable to controlling interest	91,737	72,875	181,413	125,692
Preferred stock dividends	(36,522)	(43,837)	(100,709)	(81,887)
Net earnings applicable to common shareholders	$ 55,215	$ 29,038	$ 80,704	$ 43,805
Weighted average common shares outstanding during the period:
Basic shares	182,985	182,472	182,892	182,092
Diluted shares	183,137	182,728	183,050	182,365
Net earnings per common share:
Basic, per share	$ 0.30	$ 0.16	$ 0.44	$ 0.24
Diluted, per share	$ 0.30	$ 0.16	$ 0.44	$ 0.24