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Loans and Leases (Loans and Leases Outstanding) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Acquired $ 1,443,336 [1] $ 1,809,235 [2] $ 1,999,351 [1]
Originated 11,655,469 [2] 11,576,115 [2] 11,462,458 [2]
Total loans and leases 13,098,805 13,385,350 13,461,809
Commercial Mortgage
      
Acquired 1,140,029 1,450,035 1,598,579
Originated 8,140,071 7,994,495 7,825,628
Non-Commercial Loans
      
Acquired 303,307 359,200 400,772
Originated 3,515,398 3,581,620 3,636,830
Construction and Land Development | Commercial Mortgage
      
Acquired 160,733 237,906 272,445
Originated 305,789 309,190 329,151
Construction and Land Development | Non-Commercial Loans
      
Acquired 9,009 20,793 39,294
Originated 119,253 131,992 127,726
Commercial Mortgage | Commercial Mortgage
      
Acquired 859,038 1,054,473 1,142,677
Originated 6,135,068 6,029,435 5,883,116
Other Commercial Real Estate | Commercial Mortgage
      
Acquired 81,904 107,119 115,787
Originated 176,031 160,980 162,579
Commercial and Industrial | Commercial Mortgage
      
Acquired 37,336 49,463 66,442
Originated 997,504 1,038,530 989,341
Lease Financing | Commercial Mortgage
      
Originated 352,818 330,679 320,703
Other | Commercial Mortgage
      
Acquired 1,018 1,074 1,228
Originated 172,861 125,681 140,738
Residential Mortgage | Non-Commercial Loans
      
Acquired 256,972 297,926 322,053
Originated 884,020 822,889 809,230
Revolving Mortgage | Non-Commercial Loans
      
Acquired 36,153 38,710 37,110
Originated 2,123,814 2,210,133 2,268,210
Consumer | Non-Commercial Loans
      
Acquired 1,173 1,771 2,315
Originated 388,311 416,606 431,664
Impaired At Acquisition Date
      
Acquired 217,476 290,626 337,648
Impaired At Acquisition Date | Commercial Mortgage
      
Acquired 162,627 217,807 241,606
Impaired At Acquisition Date | Non-Commercial Loans
      
Acquired 54,849 72,819 96,042
Impaired At Acquisition Date | Construction and Land Development | Commercial Mortgage
      
Acquired 41,572 71,225 86,056
Impaired At Acquisition Date | Construction and Land Development | Non-Commercial Loans
      
Acquired 8,616 15,136 31,767
Impaired At Acquisition Date | Commercial Mortgage | Commercial Mortgage
      
Acquired 90,910 107,281 121,580
Impaired At Acquisition Date | Other Commercial Real Estate | Commercial Mortgage
      
Acquired 23,716 35,369 29,199
Impaired At Acquisition Date | Commercial and Industrial | Commercial Mortgage
      
Acquired 6,429 3,932 4,771
Impaired At Acquisition Date | Other | Commercial Mortgage
      
Acquired 0 0 0
Impaired At Acquisition Date | Residential Mortgage | Non-Commercial Loans
      
Acquired 36,740 48,077 55,585
Impaired At Acquisition Date | Revolving Mortgage | Non-Commercial Loans
      
Acquired 9,493 9,606 8,286
Impaired At Acquisition Date | Consumer | Non-Commercial Loans
      
Acquired $ 0 $ 0 $ 404
[1] Unaudited
[2] Derived from 2012 Annual Report on Form 10-K.