Loans (Accruing And Non-Accruing Loans By Class) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 16,732,123,000	[1]	$ 16,230,166,000		$ 15,119,461,000
Commercial Financial And Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	9,604,544,000				7,700,628,000
Total Non-Accruing	33,811,000				52,367,000
Loans, net of unearned income	9,638,355,000		9,007,286,000		7,752,995,000
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	4,803,417,000				5,125,993,000
Total Non-Accruing	119,400,000				132,021,000
Loans, net of unearned income	4,922,817,000	[2]	5,048,071,000	[2]	5,258,014,000	[2]
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	1,307,561,000				1,137,484,000
Total Non-Accruing	13,336,000				14,934,000
Loans, net of unearned income	1,320,897,000		1,277,717,000		1,152,418,000
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	478,781,000				582,041,000
Total Non-Accruing	32,927,000				40,201,000
Loans, net of unearned income	511,708,000		538,961,000		622,242,000
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	337,591,000				332,396,000
Total Non-Accruing	755,000				1,396,000
Loans, net of unearned income	338,346,000		358,131,000		333,792,000
General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	7,632,751,000				6,648,913,000
Total Non-Accruing	20,877,000				39,111,000
Loans, net of unearned income	7,653,628,000				6,688,024,000
Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	1,641,553,000				709,411,000
Total Non-Accruing	119,000				141,000
Loans, net of unearned income	1,641,672,000				709,552,000
TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	325,382,000	[3]			335,543,000	[4]
Total Non-Accruing	12,815,000	[3]			13,115,000	[4]
Loans, net of unearned income	338,197,000	[3]			348,658,000	[4]
LOCOM valuation allowance	26,200,000				26,600,000
Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	1,250,480,000				1,060,798,000
Total Non-Accruing	13,336,000				12,216,000
Loans, net of unearned income	1,263,816,000				1,073,014,000
Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	31,656,000				37,798,000
Total Non-Accruing	0				2,718,000
Loans, net of unearned income	31,656,000				40,516,000
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	2,281,475,000				2,660,956,000
Total Non-Accruing	83,335,000				86,861,000
Loans, net of unearned income	2,364,810,000				2,747,817,000
R E Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	2,519,542,000				2,464,334,000
Total Non-Accruing	36,065,000				45,160,000
Loans, net of unearned income	2,555,607,000				2,509,494,000
Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	179,949,000				183,443,000
Total Non-Accruing	0				0
Loans, net of unearned income	179,949,000				183,443,000
Other Consumer Loans Class
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	157,633,000				148,953,000
Total Non-Accruing	755,000				1,396,000
Loans, net of unearned income	158,388,000				150,349,000
C&I Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	4,858,000				6,761,000
Total Non-Accruing	0				0
Loans, net of unearned income	4,858,000				6,761,000
CRE Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	25,425,000				38,888,000
Total Non-Accruing	0				0
Loans, net of unearned income	25,425,000				38,888,000
RE Installment Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	2,400,000				703,000
Total Non-Accruing	0				0
Loans, net of unearned income	2,400,000				703,000
Other Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing	9,000				0
Total Non-Accruing	0				0
Loans, net of unearned income	9,000				0
Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	16,453,914,000				14,772,541,000
30-89 Days Past Due	50,037,000				79,406,000
90+ Days Past Due	27,943,000				26,595,000
Total Accruing	16,531,894,000				14,878,542,000
Accruing | Commercial Financial And Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	9,597,421,000				7,679,585,000
30-89 Days Past Due	6,206,000				19,121,000
90+ Days Past Due	917,000				1,922,000
Accruing | Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	4,755,086,000				5,072,914,000
30-89 Days Past Due	32,677,000				34,546,000
90+ Days Past Due	15,654,000				18,533,000
Accruing | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,303,201,000				1,118,874,000
30-89 Days Past Due	752,000				17,067,000
90+ Days Past Due	3,608,000				1,543,000
Accruing | Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	464,677,000				573,095,000
30-89 Days Past Due	8,019,000				6,101,000
90+ Days Past Due	6,085,000				2,845,000
Accruing | Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	333,529,000				328,073,000
30-89 Days Past Due	2,383,000				2,571,000
90+ Days Past Due	1,679,000				1,752,000
Accruing | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	7,627,209,000				6,629,412,000
30-89 Days Past Due	5,291,000				19,049,000
90+ Days Past Due	251,000				452,000
Accruing | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,640,638,000				709,339,000
30-89 Days Past Due	915,000				72,000
90+ Days Past Due	0				0
Accruing | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	325,382,000	[3]			335,543,000	[4]
30-89 Days Past Due	0	[3]			0	[4]
90+ Days Past Due	0	[3]			0	[4]
Accruing | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,249,793,000				1,049,843,000
30-89 Days Past Due	687,000				10,955,000
90+ Days Past Due	0				0
Accruing | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	31,591,000				37,516,000
30-89 Days Past Due	65,000				282,000
90+ Days Past Due	0				0
Accruing | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	2,250,415,000				2,624,763,000
30-89 Days Past Due	20,698,000				23,734,000
90+ Days Past Due	10,362,000				12,459,000
Accruing | R E Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	2,502,363,000				2,447,448,000
30-89 Days Past Due	11,975,000				10,812,000
90+ Days Past Due	5,204,000				6,074,000
Accruing | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	177,042,000				180,011,000
30-89 Days Past Due	1,467,000				1,810,000
90+ Days Past Due	1,440,000				1,622,000
Accruing | Other Consumer Loans Class
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	156,478,000				148,062,000
30-89 Days Past Due	916,000				761,000
90+ Days Past Due	239,000				130,000
Accruing | C&I Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	4,192,000				5,291,000
30-89 Days Past Due	0				0
90+ Days Past Due	666,000				1,470,000
Accruing | CRE Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	21,817,000				31,515,000
30-89 Days Past Due	0				5,830,000
90+ Days Past Due	3,608,000				1,543,000
Accruing | RE Installment Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	2,308,000				703,000
30-89 Days Past Due	4,000				0
90+ Days Past Due	88,000				0
Accruing | Other Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	9,000				0
30-89 Days Past Due	0				0
90+ Days Past Due	0				0
Non-Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	114,096,000				137,896,000
30-89 Days Past Due	23,665,000				14,600,000
90+ Days Past Due	62,468,000				88,423,000
Total Non-Accruing	200,229,000				240,919,000
Non-Accruing | Commercial Financial And Industrial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,441,000				16,332,000
30-89 Days Past Due	10,445,000				3,341,000
90+ Days Past Due	21,925,000				32,694,000
Non-Accruing | Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	94,491,000				102,430,000
30-89 Days Past Due	7,651,000				8,881,000
90+ Days Past Due	17,258,000				20,710,000
Non-Accruing | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,454,000				1,814,000
30-89 Days Past Due	2,817,000				330,000
90+ Days Past Due	9,065,000				12,790,000
Non-Accruing | Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	16,710,000				15,924,000
30-89 Days Past Due	2,752,000				2,048,000
90+ Days Past Due	13,465,000				22,229,000
Non-Accruing | Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0				1,396,000
30-89 Days Past Due	0				0
90+ Days Past Due	755,000				0
Non-Accruing | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,441,000				16,332,000
30-89 Days Past Due	10,445,000				3,341,000
90+ Days Past Due	8,991,000				19,438,000
Non-Accruing | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0				0
30-89 Days Past Due	0				0
90+ Days Past Due	119,000				141,000
Non-Accruing | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0	[3]			0	[4]
30-89 Days Past Due	0	[3]			0	[4]
90+ Days Past Due	12,815,000	[3]			13,115,000	[4]
Non-Accruing | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,454,000				1,814,000
30-89 Days Past Due	2,817,000				330,000
90+ Days Past Due	9,065,000				10,072,000
Non-Accruing | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0				0
30-89 Days Past Due	0				0
90+ Days Past Due	0				2,718,000
Non-Accruing | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	66,743,000				67,361,000
30-89 Days Past Due	5,075,000				5,395,000
90+ Days Past Due	11,517,000				14,105,000
Non-Accruing | R E Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	27,748,000				35,069,000
30-89 Days Past Due	2,576,000				3,486,000
90+ Days Past Due	5,741,000				6,605,000
Non-Accruing | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0				0
30-89 Days Past Due	0				0
90+ Days Past Due	0				0
Non-Accruing | Other Consumer Loans Class
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0				1,396,000
30-89 Days Past Due	0				0
90+ Days Past Due	755,000				0
Non-Accruing | C&I Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0				0
30-89 Days Past Due	0				0
90+ Days Past Due	0				0
Non-Accruing | CRE Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0				0
30-89 Days Past Due	0				0
90+ Days Past Due	0				0
Non-Accruing | RE Installment Purchase Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0				0
30-89 Days Past Due	0				0
90+ Days Past Due	0				0
Non-Accruing | Other Purchased Credit Impaired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0				0
30-89 Days Past Due	0				0
90+ Days Past Due	$ 0				$ 0

[1] (b) March 31, 2015 includes $28.0 million of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of foreclosure.

[2] (a) Balances as of March 31, 2015 and 2014, and December 31, 2014 include $71.6 million, $86.7 million, and $76.8 million of restricted real estate loans, respectively. See Note 13 - Variable Interest Entities for additional information.

[3] Total TRUPS includes LOCOM valuation allowance of $26.2 million.

[4] Total TRUPS includes LOCOM valuation allowance of $26.6 million.