Loans And Allowance For Loan Losses (Loan Portfolio Credit Exposure) (Details) (USD $)	Dec. 31, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	$ 6,449,452,000		$ 7,270,618,000
Commercial and industrial	9,101,514,000		8,941,274,000
Total retail	4,011,097,000		3,879,907,000
Total loans	19,562,063,000		20,091,799,000
Nonaccrual substandard loans	518,100,000		844,000,000
Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	1,542,397,000		1,619,585,000
Total loans	1,542,397,000		1,619,585,000
Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	1,394,248,000		1,411,749,000
Total loans	1,394,248,000		1,411,749,000
Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	263,561,000		273,098,000
Total loans	263,561,000		273,098,000
Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	516,349,000		300,332,000
Total loans	516,349,000		300,332,000
Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	294,542,000		275,143,000
Total loans	294,542,000		275,143,000
Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	4,376,118,000		4,557,313,000
Total loans	4,376,118,000		4,557,313,000
1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	1,279,105,000		1,618,484,000
Total loans	1,279,105,000		1,618,484,000
Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	794,229,000		1,094,821,000
Total loans	794,229,000		1,094,821,000
Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,011,097,000		3,879,907,000
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	4,979,137,000		4,920,805,000
Commercial and industrial	8,069,049,000		7,265,761,000
Total retail	3,921,002,000		3,756,833,000
Total loans	16,969,188,000		15,943,399,000
Pass [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	1,511,729,000		1,578,938,000
Pass [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	1,355,644,000		1,344,648,000
Pass [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	260,194,000		270,624,000
Pass [Member] | Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	504,491,000		294,048,000
Pass [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	288,944,000		268,575,000
Pass [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	3,659,102,000		3,443,363,000
Pass [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	903,213,000		977,083,000
Pass [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	416,822,000		500,359,000
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	804,365,000		1,179,960,000
Commercial and industrial	572,591,000		909,255,000
Total retail	0		0
Total loans	1,376,956,000		2,089,215,000
Special Mention [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	0		0
Special Mention [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	0		0
Special Mention [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	0		0
Special Mention [Member] | Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	0		0
Special Mention [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	0		0
Special Mention [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	463,532,000		778,009,000
Special Mention [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	197,148,000		269,152,000
Special Mention [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	143,685,000		132,799,000
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	657,917,000	[1]	1,145,622,000	[1]
Commercial and industrial	447,955,000	[1]	754,934,000	[1]
Total retail	84,835,000	[1]	119,586,000	[1]
Total loans	1,190,707,000	[1]	2,020,142,000	[1]
Substandard [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	29,094,000	[1]	39,811,000	[1]
Substandard [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	38,023,000	[1]	66,478,000	[1]
Substandard [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	1,776,000	[1]	948,000	[1]
Substandard [Member] | Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	10,563,000	[1]	5,978,000	[1]
Substandard [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	5,379,000	[1]	6,371,000	[1]
Substandard [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	253,484,000	[1]	328,402,000	[1]
Substandard [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	176,672,000	[1]	361,210,000	[1]
Substandard [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	227,761,000	[1]	456,010,000	[1]
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	7,914,000	[2]	24,231,000	[2]
Commercial and industrial	11,819,000	[2]	11,324,000	[2]
Total retail	0	[2]	0	[2]
Total loans	19,733,000	[2]	35,555,000	[2]
Doubtful [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	0	[2]	0	[2]
Doubtful [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	0	[2]	0	[2]
Doubtful [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	0	[2]	0	[2]
Doubtful [Member] | Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	0		0
Doubtful [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	0	[2]	0	[2]
Doubtful [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	0	[2]	7,539,000	[2]
Doubtful [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	1,953,000	[2]	11,039,000	[2]
Doubtful [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	5,961,000	[2]	5,653,000	[2]
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	119,000	[2],[3]	0
Commercial and industrial	100,000	[2],[3]	0
Total retail	5,260,000		3,488,000
Total loans	5,479,000		3,488,000
Loss [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	1,574,000	[2],[4]	836,000	[2],[4]
Loss [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	581,000	[2],[4]	623,000	[2],[4]
Loss [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	1,591,000		1,526,000
Loss [Member] | Small Business [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	1,295,000	[2],[4]	306,000	[2],[4]
Loss [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total retail	219,000	[2],[4]	197,000	[2],[4]
Loss [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	0		0
Loss [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	119,000	[2],[3]	0
Loss [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial real estate loans	$ 0		$ 0

[1] Includes $518.1 million and $844.0 million of non-accrual substandard loans at December 31, 2012 and December 31, 2011, respectively.

[2] The loans within these risk grades are on non-accrual status.

[3] Amount was fully reserved at December 31, 2012 and was charged-off during the first quarter of 2013.

[4] Represent amounts that were 120 days past due. These credits are downgraded to the loss category with an allowance for loan losses equal to the full loan amount and are charged off in the subsequent quarter.