Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income:
Interest and fees on loans	$ 1,728,706	$ 1,686,220	$ 1,729,652
Interest on money market investments	21,688	23,165	21,414
Interest on securities	203,920	124,086	101,936
Total interest income	1,954,314	1,833,471	1,853,002
Interest expense:
Interest on deposits	49,247	49,344	49,736
Interest on short- and long-term borrowings	37,719	68,867	123,262
Total interest expense	86,966	118,211	172,998
Net interest income	1,867,348	1,715,260	1,680,004
Provision for loan losses	92,775	40,035	(98,082)
Net interest income after provision for loan losses	1,774,573	1,675,225	1,778,086
Noninterest income:
Service charges and fees on deposit accounts	171,185	168,451	168,291
Other service charges, commissions and fees	207,666	186,907	178,053
Wealth management income	37,434	31,224	30,573
Loan sales and servicing income	35,466	30,731	29,154
Capital markets and foreign exchange	21,713	25,655	22,584
Dividends and other investment income	24,053	30,150	43,662
Fair value and nonhedge derivative loss	2,206	(111)	(11,390)
Equity securities gains, net	7,168	11,875	13,471
Fixed income securities gains (losses), net	102	(138,735)	10,419
Impairment losses on investment securities:
Impairment losses on investment securities	0	0	(27)
Less amounts recognized in other comprehensive income	0	0	0
Net impairment losses on investment securities	0	0	(27)
Other	8,616	11,094	7,914
Total noninterest income	515,609	357,241	492,704
Noninterest expense:
Salaries and employee benefits	982,531	972,712	956,411
Occupancy, net	125,273	119,529	115,701
Furniture, equipment, and software	124,677	123,196	115,312
Other real estate expense	(1,597)	(647)	(1,251)
Credit-related expense	25,671	28,541	28,134
Provision for unfunded lending commitments	(9,927)	(6,238)	(8,629)
Professional and Legal services	55,094	50,421	66,011
Advertising	22,143	25,314	25,100
FDIC premiums	39,675	34,422	32,174
Amortization of core deposit and other intangibles	7,853	9,247	10,923
Debt extinguishment cost	(353)	(2,530)	(44,422)
Other	213,528	221,580	265,059
Total noninterest expense	1,585,274	1,580,607	1,649,367
Income before income taxes	704,908	451,859	621,423
Income taxes	235,858	142,388	222,961
Net income	469,050	309,471	398,462
Preferred stock dividends	(47,982)	(62,857)	(71,894)
Preferred stock redemption	(9,759)	0	0
Net earnings applicable to common shareholders	$ 411,309	$ 246,614	$ 326,568
Weighted average common shares outstanding during the period:
Basic shares	203,855	203,265	192,207
Diluted shares	204,269	203,698	192,789
Net earnings per common share:
Basic, per share	$ 2.00	$ 1.20	$ 1.68
Diluted, per share	$ 1.99	$ 1.20	$ 1.68