Loans and Allowance for Loan Losses (Loan Portfolio Credit Exposure) (Details) (USD $)	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 19,693,445,000	[1],[2]	$ 20,091,799,000	[1],[3]	$ 20,513,597,000	[4]
Nonaccrual substandard loans	692,700,000		844,000,000
Deferred fees and costs, net	13,300,000		12,000,000		8,800,000
Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,603,905,000	[1]	1,619,585,000	[1]
Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,383,915,000	[1]	1,411,749,000	[1]
Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	262,402,000	[1]	273,098,000	[1]
Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	674,313,000	[1]	575,475,000	[1]
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	8,884,633,000	[1]	8,941,274,000	[1]
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	6,884,277,000	[1]	7,270,618,000	[1]
Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,416,610,000	[1]	4,557,313,000	[1]
1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,483,824,000	[1]	1,618,484,000	[1]
Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	983,843,000	[1]	1,094,821,000	[1]
Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,924,535,000	[1]	3,879,907,000	[1]
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,218,967,000	[1]	15,943,399,000	[1]
Pass [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,566,529,000	[1]	1,578,938,000	[1]
Pass [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,334,087,000	[1]	1,344,648,000	[1]
Pass [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	260,576,000	[1]	270,624,000	[1]
Pass [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	660,408,000	[1]	562,623,000	[1]
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,480,129,000	[1]	7,265,761,000	[1]
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,917,238,000	[1]	4,920,805,000	[1]
Pass [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,506,978,000	[1]	3,443,363,000	[1]
Pass [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	945,776,000	[1]	977,083,000	[1]
Pass [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	464,484,000	[1]	500,359,000	[1]
Pass [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,821,600,000	[1]	3,756,833,000	[1]
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,651,920,000	[1]	2,089,215,000	[1]
Special Mention [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1]	0	[1]
Special Mention [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1]	0	[1]
Special Mention [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1]	0	[1]
Special Mention [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1]	0	[1]
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	734,989,000	[1]	909,255,000	[1]
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	916,931,000	[1]	1,179,960,000	[1]
Special Mention [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	563,124,000	[1]	778,009,000	[1]
Special Mention [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	235,318,000	[1]	269,152,000	[1]
Special Mention [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	118,489,000	[1]	132,799,000	[1]
Special Mention [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1]	0	[1]
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,760,081,000	[1]	2,020,142,000	[1]
Substandard [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	35,841,000	[1],[5]	39,811,000	[1],[5]
Substandard [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	49,132,000	[1],[5]	66,478,000	[1],[5]
Substandard [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	621,000	[1],[5]	948,000	[1],[5]
Substandard [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,598,000	[1],[5]	12,349,000	[1],[5]
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	648,594,000	[1],[5]	754,934,000	[1],[5]
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,013,295,000	[1]	1,145,622,000	[1]
Substandard [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	335,175,000	[1],[5]	328,402,000	[1],[5]
Substandard [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	289,345,000	[1],[5]	361,210,000	[1],[5]
Substandard [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	388,775,000	[1],[5]	456,010,000	[1],[5]
Substandard [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	98,192,000	[1]	119,586,000	[1]
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	57,670,000	[1]	35,555,000	[1]
Doubtful [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1],[6]	0	[1],[6]
Doubtful [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1],[6]	0	[1],[6]
Doubtful [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1],[6]	0	[1],[6]
Doubtful [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1],[6]	0	[1],[6]
Doubtful [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	20,857,000	[1],[6]	11,324,000	[1],[6]
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	36,813,000	[1]	24,231,000	[1]
Doubtful [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,333,000	[1],[6]	7,539,000	[1],[6]
Doubtful [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	13,385,000	[1],[6]	11,039,000	[1],[6]
Doubtful [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	12,095,000	[1],[6]	5,653,000	[1],[6]
Doubtful [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1]	0	[1]
Loss [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	4,807,000	[1]	3,488,000	[1]
Loss [Member] | Home Equity Lines [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,535,000	[1],[6],[7]	836,000	[1],[6],[7]
Loss [Member] | Consumer Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	696,000	[1],[6],[7]	623,000	[1],[6],[7]
Loss [Member] | Credit Cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,205,000	[1],[6]	1,526,000	[1],[6],[7]
Loss [Member] | Other Retail Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,307,000	[1],[6],[7]	503,000	[1],[6],[7]
Loss [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	64,000	[1],[6]	0	[1],[6]
Loss [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1]	0	[1]
Loss [Member] | Investment Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1],[6]	0	[1],[6]
Loss [Member] | 1-4 Family Properties [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1],[6]	0	[1],[6]
Loss [Member] | Land Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	[1],[6]	0	[1],[6]
Loss [Member] | Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 4,743,000	[1]	$ 3,488,000	[1]

[1] Loan balances in each category expressed as a component of total loans, excluding deferred fees and costs.

[2] Total excludes $13.3 million in net deferred fees and costs

[3] Total excludes $12.0 million in net deferred fees and costs

[4] Total excludes $8.8 million in net deferred fees and costs

[5] Includes $692.7 million and $844.0 million of non-accrual substandard loans at June 30, 2012 and December 31, 2011, respectively.

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

[7] 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.