Loans and Allowance for Loan Losses (Loan Portfolio Credit Exposure) (Details) (USD $)							3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013		Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Home Equity Lines [Member]	Dec. 31, 2013 Home Equity Lines [Member]	Mar. 31, 2014 Consumer Mortgages [Member]	Dec. 31, 2013 Consumer Mortgages [Member]	Mar. 31, 2014 Credit Cards [Member]	Dec. 31, 2013 Credit Cards [Member]	Mar. 31, 2014 Other Retail Loans [Member]	Dec. 31, 2013 Other Retail Loans [Member]	Mar. 31, 2014 Commercial and Industrial [Member]	Dec. 31, 2013 Commercial and Industrial [Member]	Mar. 31, 2014 Commercial Real Estate [Member]	Dec. 31, 2013 Commercial Real Estate [Member]	Mar. 31, 2014 Investment Properties [Member]	Dec. 31, 2013 Investment Properties [Member]	Mar. 31, 2014 1-4 Family Properties [Member]	Dec. 31, 2013 1-4 Family Properties [Member]	Mar. 31, 2014 Land Acquisition [Member]	Dec. 31, 2013 Land Acquisition [Member]	Mar. 31, 2014 Commercial, Financial and Agricultural [Member]	Dec. 31, 2013 Commercial, Financial and Agricultural [Member]	Mar. 31, 2014 Owner-Occupied [Member]	Dec. 31, 2013 Owner-Occupied [Member]	Mar. 31, 2014 Small Business [Member]	Dec. 31, 2013 Small Business [Member]	Mar. 31, 2014 Retail [Member]	Dec. 31, 2013 Retail [Member]	Mar. 31, 2014 Pass [Member]	Dec. 31, 2013 Pass [Member]	Mar. 31, 2014 Pass [Member] Home Equity Lines [Member]	Dec. 31, 2013 Pass [Member] Home Equity Lines [Member]	Mar. 31, 2014 Pass [Member] Consumer Mortgages [Member]	Dec. 31, 2013 Pass [Member] Consumer Mortgages [Member]	Mar. 31, 2014 Pass [Member] Credit Cards [Member]	Dec. 31, 2013 Pass [Member] Credit Cards [Member]	Mar. 31, 2014 Pass [Member] Other Retail Loans [Member]	Dec. 31, 2013 Pass [Member] Other Retail Loans [Member]	Mar. 31, 2014 Pass [Member] Commercial and Industrial [Member]	Dec. 31, 2013 Pass [Member] Commercial and Industrial [Member]	Mar. 31, 2014 Pass [Member] Commercial Real Estate [Member]	Dec. 31, 2013 Pass [Member] Commercial Real Estate [Member]	Mar. 31, 2014 Pass [Member] Investment Properties [Member]	Dec. 31, 2013 Pass [Member] Investment Properties [Member]	Mar. 31, 2014 Pass [Member] 1-4 Family Properties [Member]	Dec. 31, 2013 Pass [Member] 1-4 Family Properties [Member]	Mar. 31, 2014 Pass [Member] Land Acquisition [Member]	Dec. 31, 2013 Pass [Member] Land Acquisition [Member]	Mar. 31, 2014 Pass [Member] Commercial, Financial and Agricultural [Member]	Dec. 31, 2013 Pass [Member] Commercial, Financial and Agricultural [Member]	Mar. 31, 2014 Pass [Member] Owner-Occupied [Member]	Dec. 31, 2013 Pass [Member] Owner-Occupied [Member]	Mar. 31, 2014 Pass [Member] Small Business [Member]	Dec. 31, 2013 Pass [Member] Small Business [Member]	Mar. 31, 2014 Pass [Member] Retail [Member]	Dec. 31, 2013 Pass [Member] Retail [Member]	Mar. 31, 2014 Special Mention [Member]	Dec. 31, 2013 Special Mention [Member]	Mar. 31, 2014 Special Mention [Member] Home Equity Lines [Member]	Dec. 31, 2013 Special Mention [Member] Home Equity Lines [Member]	Mar. 31, 2014 Special Mention [Member] Consumer Mortgages [Member]	Dec. 31, 2013 Special Mention [Member] Consumer Mortgages [Member]	Mar. 31, 2014 Special Mention [Member] Credit Cards [Member]	Dec. 31, 2013 Special Mention [Member] Credit Cards [Member]	Mar. 31, 2014 Special Mention [Member] Other Retail Loans [Member]	Dec. 31, 2013 Special Mention [Member] Other Retail Loans [Member]	Mar. 31, 2014 Special Mention [Member] Commercial and Industrial [Member]	Dec. 31, 2013 Special Mention [Member] Commercial and Industrial [Member]	Mar. 31, 2014 Special Mention [Member] Commercial Real Estate [Member]	Dec. 31, 2013 Special Mention [Member] Commercial Real Estate [Member]	Mar. 31, 2014 Special Mention [Member] Investment Properties [Member]	Dec. 31, 2013 Special Mention [Member] Investment Properties [Member]	Mar. 31, 2014 Special Mention [Member] 1-4 Family Properties [Member]	Dec. 31, 2013 Special Mention [Member] 1-4 Family Properties [Member]	Mar. 31, 2014 Special Mention [Member] Land Acquisition [Member]	Dec. 31, 2013 Special Mention [Member] Land Acquisition [Member]	Mar. 31, 2014 Special Mention [Member] Commercial, Financial and Agricultural [Member]	Dec. 31, 2013 Special Mention [Member] Commercial, Financial and Agricultural [Member]	Mar. 31, 2014 Special Mention [Member] Owner-Occupied [Member]	Dec. 31, 2013 Special Mention [Member] Owner-Occupied [Member]	Mar. 31, 2014 Special Mention [Member] Small Business [Member]	Dec. 31, 2013 Special Mention [Member] Small Business [Member]	Mar. 31, 2014 Special Mention [Member] Retail [Member]	Dec. 31, 2013 Special Mention [Member] Retail [Member]	Mar. 31, 2014 Substandard [Member]		Dec. 31, 2013 Substandard [Member]		Mar. 31, 2014 Substandard [Member] Home Equity Lines [Member]		Dec. 31, 2013 Substandard [Member] Home Equity Lines [Member]		Mar. 31, 2014 Substandard [Member] Consumer Mortgages [Member]		Dec. 31, 2013 Substandard [Member] Consumer Mortgages [Member]		Mar. 31, 2014 Substandard [Member] Credit Cards [Member]		Dec. 31, 2013 Substandard [Member] Credit Cards [Member]		Mar. 31, 2014 Substandard [Member] Other Retail Loans [Member]		Dec. 31, 2013 Substandard [Member] Other Retail Loans [Member]		Mar. 31, 2014 Substandard [Member] Commercial and Industrial [Member]		Dec. 31, 2013 Substandard [Member] Commercial and Industrial [Member]		Mar. 31, 2014 Substandard [Member] Commercial Real Estate [Member]		Dec. 31, 2013 Substandard [Member] Commercial Real Estate [Member]		Mar. 31, 2014 Substandard [Member] Investment Properties [Member]		Dec. 31, 2013 Substandard [Member] Investment Properties [Member]		Mar. 31, 2014 Substandard [Member] 1-4 Family Properties [Member]		Dec. 31, 2013 Substandard [Member] 1-4 Family Properties [Member]		Mar. 31, 2014 Substandard [Member] Land Acquisition [Member]		Dec. 31, 2013 Substandard [Member] Land Acquisition [Member]		Mar. 31, 2014 Substandard [Member] Commercial, Financial and Agricultural [Member]		Dec. 31, 2013 Substandard [Member] Commercial, Financial and Agricultural [Member]		Mar. 31, 2014 Substandard [Member] Owner-Occupied [Member]		Dec. 31, 2013 Substandard [Member] Owner-Occupied [Member]		Mar. 31, 2014 Substandard [Member] Small Business [Member]		Dec. 31, 2013 Substandard [Member] Small Business [Member]		Mar. 31, 2014 Substandard [Member] Retail [Member]		Dec. 31, 2013 Substandard [Member] Retail [Member]		Mar. 31, 2014 Doubtful [Member]		Dec. 31, 2013 Doubtful [Member]		Mar. 31, 2014 Doubtful [Member] Home Equity Lines [Member]		Dec. 31, 2013 Doubtful [Member] Home Equity Lines [Member]		Mar. 31, 2014 Doubtful [Member] Consumer Mortgages [Member]		Dec. 31, 2013 Doubtful [Member] Consumer Mortgages [Member]		Mar. 31, 2014 Doubtful [Member] Credit Cards [Member]		Dec. 31, 2013 Doubtful [Member] Credit Cards [Member]		Mar. 31, 2014 Doubtful [Member] Other Retail Loans [Member]		Dec. 31, 2013 Doubtful [Member] Other Retail Loans [Member]		Mar. 31, 2014 Doubtful [Member] Commercial and Industrial [Member]		Dec. 31, 2013 Doubtful [Member] Commercial and Industrial [Member]		Mar. 31, 2014 Doubtful [Member] Commercial Real Estate [Member]		Dec. 31, 2013 Doubtful [Member] Commercial Real Estate [Member]		Mar. 31, 2014 Doubtful [Member] Investment Properties [Member]		Dec. 31, 2013 Doubtful [Member] Investment Properties [Member]		Mar. 31, 2014 Doubtful [Member] 1-4 Family Properties [Member]		Dec. 31, 2013 Doubtful [Member] 1-4 Family Properties [Member]		Mar. 31, 2014 Doubtful [Member] Land Acquisition [Member]		Dec. 31, 2013 Doubtful [Member] Land Acquisition [Member]		Mar. 31, 2014 Doubtful [Member] Commercial, Financial and Agricultural [Member]		Dec. 31, 2013 Doubtful [Member] Commercial, Financial and Agricultural [Member]		Mar. 31, 2014 Doubtful [Member] Owner-Occupied [Member]		Dec. 31, 2013 Doubtful [Member] Owner-Occupied [Member]		Mar. 31, 2014 Doubtful [Member] Small Business [Member]		Dec. 31, 2013 Doubtful [Member] Small Business [Member]		Mar. 31, 2014 Doubtful [Member] Retail [Member]		Dec. 31, 2013 Doubtful [Member] Retail [Member]		Mar. 31, 2014 Loss [Member]	Dec. 31, 2013 Loss [Member]	Mar. 31, 2014 Loss [Member] Home Equity Lines [Member]		Dec. 31, 2013 Loss [Member] Home Equity Lines [Member]		Mar. 31, 2014 Loss [Member] Consumer Mortgages [Member]		Dec. 31, 2013 Loss [Member] Consumer Mortgages [Member]		Mar. 31, 2014 Loss [Member] Credit Cards [Member]		Dec. 31, 2013 Loss [Member] Credit Cards [Member]		Mar. 31, 2014 Loss [Member] Other Retail Loans [Member]		Dec. 31, 2013 Loss [Member] Other Retail Loans [Member]		Mar. 31, 2014 Loss [Member] Commercial and Industrial [Member]		Dec. 31, 2013 Loss [Member] Commercial and Industrial [Member]	Mar. 31, 2014 Loss [Member] Commercial Real Estate [Member]	Dec. 31, 2013 Loss [Member] Commercial Real Estate [Member]		Mar. 31, 2014 Loss [Member] Investment Properties [Member]	Dec. 31, 2013 Loss [Member] Investment Properties [Member]	Mar. 31, 2014 Loss [Member] 1-4 Family Properties [Member]	Dec. 31, 2013 Loss [Member] 1-4 Family Properties [Member]		Mar. 31, 2014 Loss [Member] Land Acquisition [Member]	Dec. 31, 2013 Loss [Member] Land Acquisition [Member]	Mar. 31, 2014 Loss [Member] Commercial, Financial and Agricultural [Member]		Dec. 31, 2013 Loss [Member] Commercial, Financial and Agricultural [Member]		Mar. 31, 2014 Loss [Member] Owner-Occupied [Member]	Dec. 31, 2013 Loss [Member] Owner-Occupied [Member]	Mar. 31, 2014 Loss [Member] Small Business [Member]	Dec. 31, 2013 Loss [Member] Small Business [Member]	Mar. 31, 2014 Loss [Member] Retail [Member]	Dec. 31, 2013 Loss [Member] Retail [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 20,187,440,000	[1]	$ 20,086,660,000	[2]	$ 19,389,439,000	[3]		$ 1,601,757,000	$ 1,587,541,000	$ 1,504,213,000	$ 1,519,068,000	$ 253,149,000	$ 256,846,000	$ 279,786,000	$ 284,778,000	$ 10,062,376,000	$ 9,972,869,000	$ 6,486,159,000	$ 6,465,558,000	$ 4,698,469,000	$ 4,603,754,000	$ 1,113,012,000	$ 1,156,471,000	$ 674,678,000	$ 705,333,000	$ 5,505,577,000	$ 5,490,214,000	$ 3,773,656,000	$ 3,795,439,000	$ 783,143,000	$ 687,216,000	$ 3,638,905,000	$ 3,648,233,000	$ 18,563,834,000	$ 18,277,301,000	$ 1,575,012,000	$ 1,559,272,000	$ 1,460,349,000	$ 1,475,928,000	$ 251,543,000	$ 255,339,000	$ 275,807,000	$ 281,179,000	$ 9,381,867,000	$ 9,206,367,000	$ 5,619,256,000	$ 5,499,216,000	$ 4,328,462,000	$ 4,184,748,000	$ 872,167,000	$ 892,512,000	$ 418,627,000	$ 421,956,000	$ 5,129,502,000	$ 5,053,808,000	$ 3,483,270,000	$ 3,478,359,000	$ 769,095,000	$ 674,200,000	$ 3,562,711,000	$ 3,571,718,000	$ 740,556,000	$ 850,638,000	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 322,475,000	$ 379,717,000	$ 418,081,000	$ 470,921,000	$ 227,404,000	$ 249,890,000	$ 120,235,000	$ 126,715,000	$ 70,442,000	$ 94,316,000	$ 186,826,000	$ 224,620,000	$ 135,649,000	$ 155,097,000	$ 0	$ 0	$ 0	$ 0	$ 850,616,000	[4]	$ 926,405,000	[4]	$ 22,627,000	[4]	$ 24,931,000	[4]	$ 40,480,000	[4]	$ 40,935,000	[4]	$ 642,000	[4]	$ 541,000	[4]	$ 3,812,000	[4]	$ 3,400,000	[4]	$ 344,900,000	[4]	$ 373,802,000	[4]	$ 438,155,000	[4]	$ 482,796,000	[4]	$ 140,891,000	[4]	$ 167,392,000	[4]	$ 112,603,000	[4]	$ 128,890,000	[4]	$ 184,661,000	[4]	$ 186,514,000	[4]	$ 177,969,000	[4]	$ 201,410,000	[4]	$ 153,672,000	[4]	$ 160,173,000	[4]	$ 13,259,000	[4]	$ 12,219,000	[4]	$ 67,561,000	[4]	$ 69,807,000	[4]	$ 28,634,000	[5]	$ 28,667,000	[5]	$ 1,771,000	[5]	$ 1,448,000	[5]	$ 3,100,000	[5]	$ 1,918,000	[5]	$ 0	[5]	$ 0	[5]	$ 50,000	[5]	$ 75,000	[5]	$ 13,046,000	[5]	$ 12,893,000	[5]	$ 10,667,000	[5]	$ 12,333,000	[5]	$ 1,712,000	[5]	$ 1,724,000	[5]	$ 8,007,000	[5]	$ 8,062,000	[5]	$ 948,000	[5]	$ 2,547,000	[5]	$ 11,192,000	[5]	$ 10,286,000	[5]	$ 1,065,000	[5]	$ 1,810,000	[5]	$ 789,000	[5]	$ 797,000	[5]	$ 4,921,000	[5]	$ 3,441,000	[5]	$ 3,800,000	$ 3,649,000	$ 2,347,000	[6]	$ 1,890,000	[6]	$ 284,000	[6]	$ 287,000	[6]	$ 964,000	[7]	$ 966,000	[7]	$ 117,000	[6]	$ 124,000	[6]	$ 88,000	[5],[6]	$ 90,000	$ 0	$ 292,000	[6]	$ 0	$ 0	$ 0	$ 292,000	[6]	$ 0	$ 0	$ 88,000	[6]	$ 90,000	[6]	$ 0	$ 0	$ 0	$ 0	$ 3,712,000	$ 3,267,000
Nonaccrual substandard loans	351,900,000		384,000,000
Allowance for loan losses, percent of loan amount							50.00%
Deferred fees and costs, net	$ 28,400,000		$ 28,900,000		$ 21,600,000

[1] Total before net deferred fees and costs of $28.4 million.

[2] Total before net deferred fees and costs of

[3] Total before net deferred fees and costs of $21.6 million.

[4] Includes $351.9 million and $384.0 million of non-accrual Substandard loans at March 31, 2014 and December 31, 2013, respectively.

[5] The loans within this risk grade are on non-accrual status and have an allowance for loan losses equal to 50% of the loan amount.

[6] The loans within this risk grade are on non-accrual status and have an allowance for loan losses equal to the full loan amount.

[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 generally charged off upon reaching 181 days past due in accordance with the FFIEC Uniform Retail Credit Classification and Account Management Policy.