Consolidated Statements Of Income - Equity Component [Domain] - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest income:
Interest and fees on loans	$ 420,642	$ 433,802	$ 836,397	$ 868,151
Interest on money market investments	5,785	4,888	11,003	10,018
Interest on Securities	28,809	24,502	56,282	52,596
Interest expense:
Interest on deposits	12,321	12,096	24,425	24,875
Interest on short- and long-term borrowings	19,211	34,812	38,207	73,136
Total interest expense	31,532	46,908	62,632	98,011
Net interest income	423,704	416,284	841,050	832,754
Provision for loan losses	566	(54,416)	(928)	(55,026)
Net interest income after provision for loan losses	423,138	470,700	841,978	887,780
Noninterest income:
Service charges and fees on deposit accounts	41,616	41,400	82,810	82,600
Other service charges, commissions and fees	51,705	47,959	99,191	92,208
Wealth management income	8,160	7,980	15,775	15,057
Gain Loss On Sales Of Loans And Servicing Income	8,382	7,332	16,088	14,428
Capital markets and foreign exchange	7,275	5,875	12,776	10,919
Dividends and other investment income	9,343	7,995	18,715	15,859
Fair value and nonhedge derivative income (loss)	1,844	(1,934)	756	(10,473)
Equity securities gains, net	4,839	2,513	8,192	3,425
Fixed income securities gains (losses), net	(138,436)	5,026	(138,675)	35,940
Impairment losses on investment securities:
Impairment losses on investment securities	0	0	0	(27)
Non-credit losses on secutities not expectd to be sold (recognized in other comprehensive income)	0	0	0	0
Net impairment losses on investment securities	0	0	0	(27)
Other	5,693	703	6,615	3,227
Total noninterest income	421	124,849	122,243	263,163
Noninterest expense:
Salaries and employee benefits	251,133	238,760	494,652	472,162
Occupancy, net	30,095	28,939	59,434	57,244
Furniture, equipment and software	31,247	27,986	60,960	55,930
Other real estate expense, net	(445)	(266)	(71)	1,341
Credit-related expense	8,106	7,161	14,045	14,107
Provision for Unfunded Lending Commitments	2,326	(6,779)	1,115	(5,767)
Professional and legal services	13,110	12,171	24,593	23,166
Advertising	6,511	6,803	13,486	13,201
FDIC premiums	8,609	8,017	16,728	15,939
Amortization of core deposit and other intangibles	2,318	2,736	4,676	5,618
Debt extinguishment cost	2,395	0	2,395	0
Other	53,347	66,941	111,778	139,615
Total noninterest expense	404,100	406,027	801,561	804,090
Income before income taxes	19,459	189,522	162,660	346,853
Income taxes	5,499	69,972	56,675	126,093
Net income	13,960	119,550	105,985	220,760
Preferred stock dividends	(15,060)	(15,060)	(31,806)	(40,080)
Net earnings applicable to common shareholders	$ (1,100)	$ 104,490	$ 74,179	$ 180,680
Weighted average common shares outstanding during the period:
Basic shares	202,888	184,668	202,746	184,555
Diluted shares	202,888	185,286	203,295	185,202
Net earnings per common share:
Basic	$ (0.01)	$ 0.56	$ 0.36	$ 0.97
Diluted	$ (0.01)	$ 0.56	$ 0.36	$ 0.97
Interest and Dividend Income, Operating	$ 455,236	$ 463,192	$ 903,682	$ 930,765