Loans (Accruing And Non-Accruing Loans By Class) (Details) (USD $)	Mar. 31, 2013		Dec. 31, 2012	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 15,889,670,000		$ 16,708,582,000	$ 15,971,330,000
TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
LOCOM valuation allowance	30,900,000			34,200,000
Commercial Financial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	8,091,186,000			7,705,153,000
Commercial Financial And Industrial [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	6,573,614,000			6,221,599,000
Commercial Financial And Industrial [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,130,079,000			1,070,581,000
Commercial Financial And Industrial [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	387,493,000	[1]		412,973,000	[2]
Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	5,590,180,000			5,858,821,000
Consumer Real Estate Portfolio Segment [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	3,108,574,000			3,582,454,000
Consumer Real Estate Portfolio Segment [Member] | R E Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	2,481,606,000			2,276,367,000
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,115,879,000			1,346,926,000
Commercial Real Estate Portfolio Segment [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	1,062,588,000			1,247,089,000
Commercial Real Estate Portfolio Segment [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	53,291,000			99,837,000
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	793,282,000			788,700,000
Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	299,143,000			271,730,000
Credit Card And Other Portfolio Segment [Member] | Credit Card Portfolio Class [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	181,223,000			182,568,000
Credit Card And Other Portfolio Segment [Member] | Other Consumer Loans Class [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	117,920,000			89,162,000
Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	15,527,027,000			15,469,608,000
30-89 Days Past Due	66,925,000			109,038,000
90+ Days Past Due	39,718,000			41,338,000
Total Accruing	15,633,670,000			15,619,984,000
Accruing [Member] | Commercial Financial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	7,964,416,000			7,521,020,000
30-89 Days Past Due	13,177,000			29,520,000
90+ Days Past Due	428,000			540,000
Total Accruing	7,978,021,000			7,551,080,000
Accruing [Member] | Commercial Financial And Industrial [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	6,493,628,000			6,112,259,000
30-89 Days Past Due	13,177,000			29,520,000
90+ Days Past Due	428,000			540,000
Total Accruing	6,507,233,000			6,142,319,000
Accruing [Member] | Commercial Financial And Industrial [Member] | Loans To Mortgage Companies [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,129,728,000			1,070,581,000
30-89 Days Past Due	0			0
90+ Days Past Due	0			0
Total Accruing	1,129,728,000			1,070,581,000
Accruing [Member] | Commercial Financial And Industrial [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	341,060,000	[1]		338,180,000	[2]
30-89 Days Past Due	0	[1]		0	[2]
90+ Days Past Due	0	[1]		0	[2]
Total Accruing	341,060,000	[1]		338,180,000	[2]
Accruing [Member] | Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	5,454,798,000			5,724,497,000
30-89 Days Past Due	40,891,000			58,946,000
90+ Days Past Due	26,591,000			30,377,000
Total Accruing	5,522,280,000			5,813,820,000
Accruing [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	3,022,483,000			3,496,858,000
30-89 Days Past Due	28,914,000			37,832,000
90+ Days Past Due	18,135,000			20,749,000
Total Accruing	3,069,532,000			3,555,439,000
Accruing [Member] | Consumer Real Estate Portfolio Segment [Member] | R E Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	2,432,315,000			2,227,639,000
30-89 Days Past Due	11,977,000			21,114,000
90+ Days Past Due	8,456,000			9,628,000
Total Accruing	2,452,748,000			2,258,381,000
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,072,613,000			1,223,263,000
30-89 Days Past Due	4,679,000			10,217,000
90+ Days Past Due	0			0
Total Accruing	1,077,292,000			1,233,480,000
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,031,037,000			1,168,182,000
30-89 Days Past Due	4,679,000			9,160,000
90+ Days Past Due	0			0
Total Accruing	1,035,716,000			1,177,342,000
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	41,576,000			55,081,000
30-89 Days Past Due	0			1,057,000
90+ Days Past Due	0			0
Total Accruing	41,576,000			56,138,000
Accruing [Member] | Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	741,500,000			734,659,000
30-89 Days Past Due	6,025,000			8,454,000
90+ Days Past Due	11,126,000			8,900,000
Total Accruing	758,651,000			752,013,000
Accruing [Member] | Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	293,700,000			266,169,000
30-89 Days Past Due	2,153,000			1,901,000
90+ Days Past Due	1,573,000			1,521,000
Total Accruing	297,426,000			269,591,000
Accruing [Member] | Credit Card And Other Portfolio Segment [Member] | Credit Card Portfolio Class [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	178,310,000			179,744,000
30-89 Days Past Due	1,430,000			1,368,000
90+ Days Past Due	1,483,000			1,456,000
Total Accruing	181,223,000			182,568,000
Accruing [Member] | Credit Card And Other Portfolio Segment [Member] | Other Consumer Loans Class [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	115,390,000			86,425,000
30-89 Days Past Due	723,000			533,000
90+ Days Past Due	90,000			65,000
Total Accruing	116,203,000			87,023,000
Non Accruing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	91,812,000			119,185,000
30-89 Days Past Due	16,740,000			24,126,000
90+ Days Past Due	147,448,000			208,035,000
Total Non-Accruing	256,000,000			351,346,000
Non Accruing [Member] | Commercial Financial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	22,439,000			35,470,000
30-89 Days Past Due	9,694,000			13,202,000
90+ Days Past Due	81,032,000			105,401,000
Total Non-Accruing	113,165,000			154,073,000
Non Accruing [Member] | Commercial Financial And Industrial [Member] | General C I [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	22,439,000			35,470,000
30-89 Days Past Due	9,694,000			13,202,000
90+ Days Past Due	34,248,000			30,608,000
Total Non-Accruing	66,381,000			79,280,000
Non Accruing [Member] | Commercial Financial And Industrial [Member] | 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	351,000			0
Total Non-Accruing	351,000			0
Non Accruing [Member] | Commercial Financial And Industrial [Member] | TRUPs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0	[1]		0	[2]
30-89 Days Past Due	0	[1]		0	[2]
90+ Days Past Due	46,433,000	[1]		74,793,000	[2]
Total Non-Accruing	46,433,000	[1]		74,793,000	[2]
Non Accruing [Member] | Consumer Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	47,764,000			22,898,000
30-89 Days Past Due	4,075,000			4,409,000
90+ Days Past Due	16,061,000			17,694,000
Total Non-Accruing	67,900,000			45,001,000
Non Accruing [Member] | Consumer Real Estate Portfolio Segment [Member] | Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	28,072,000			12,713,000
30-89 Days Past Due	1,390,000			2,937,000
90+ Days Past Due	9,580,000			11,365,000
Total Non-Accruing	39,042,000			27,015,000
Non Accruing [Member] | Consumer Real Estate Portfolio Segment [Member] | R E Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	19,692,000			10,185,000
30-89 Days Past Due	2,685,000			1,472,000
90+ Days Past Due	6,481,000			6,329,000
Total Non-Accruing	28,858,000			17,986,000
Non Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	7,026,000			46,247,000
30-89 Days Past Due	1,705,000			5,414,000
90+ Days Past Due	29,856,000			61,785,000
Total Non-Accruing	38,587,000			113,446,000
Non Accruing [Member] | Commercial Real Estate Portfolio Segment [Member] | Income C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	5,643,000			23,289,000
30-89 Days Past Due	1,705,000			2,701,000
90+ Days Past Due	19,524,000			43,757,000
Total Non-Accruing	26,872,000			69,747,000
Non Accruing [Member] | Commercial Real Estate Portfolio Segment [Member] | Residential C R E [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,383,000			22,958,000
30-89 Days Past Due	0			2,713,000
90+ Days Past Due	10,332,000			18,028,000
Total Non-Accruing	11,715,000			43,699,000
Non Accruing [Member] | Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	12,866,000			14,566,000
30-89 Days Past Due	1,266,000			1,101,000
90+ Days Past Due	20,499,000			21,020,000
Total Non-Accruing	34,631,000			36,687,000
Non Accruing [Member] | Credit Card And Other Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,717,000			4,000
30-89 Days Past Due	0			0
90+ Days Past Due	0			2,135,000
Total Non-Accruing	1,717,000			2,139,000
Non Accruing [Member] | Credit Card And Other Portfolio Segment [Member] | Credit Card Portfolio Class [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	0			0
30-89 Days Past Due	0			0
90+ Days Past Due	0			0
Total Non-Accruing	0			0
Non Accruing [Member] | Credit Card And Other Portfolio Segment [Member] | Other Consumer Loans Class [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,717,000			4,000
30-89 Days Past Due	0			0
90+ Days Past Due	0			2,135,000
Total Non-Accruing	$ 1,717,000			$ 2,139,000

[1] Total TRUPs includes LOCOM valuation allowance of $30.9 million.

[2] Total TRUPs includes LOCOM valuation allowance of $34.2 million.