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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired $ 1,188,281 [1] $ 1,809,235 [2]
Originated 11,884,585 [2] 11,576,115 [2]
Pass
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 515,375 650,661
Special Mention
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 222,170 331,614
Substandard
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 356,937 616,692
Doubtful
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 72,697 182,568
Ungraded
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 21,102 27,700
Commercial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 914,871 1,450,035
Originated 8,342,100 7,994,495
Commercial | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 93,963 237,906
Originated 300,266 309,190
Commercial | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 744,349 1,054,473
Originated 6,308,192 6,029,435
Commercial | Other commercial real estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 51,108 107,119
Originated 177,599 160,980
Commercial | Commercial and industrial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 24,448 49,463
Originated 1,009,641 1,038,530
Commercial | Lease financing
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 365,967 330,679
Commercial | Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,003 1,074
Originated 180,435 125,681
Commercial | Pass
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 7,900,642 7,459,277
Commercial | Pass | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 3,373 17,010
Originated 285,044 274,480
Commercial | Pass | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 308,809 376,974
Originated 6,019,286 5,688,541
Commercial | Pass | Other commercial real estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 22,007 33,570
Originated 172,341 151,549
Commercial | Pass | Commercial and industrial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 7,553 19,451
Originated 885,691 894,998
Commercial | Pass | Lease financing
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 359,195 325,626
Commercial | Pass | Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 179,085 124,083
Commercial | Special Mention
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 159,855 200,073
Commercial | Special Mention | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 18,395 25,734
Originated 12,060 14,666
Commercial | Special Mention | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 176,338 259,264
Originated 125,280 166,882
Commercial | Special Mention | Other commercial real estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 6,602 17,518
Originated 1,241 2,812
Commercial | Special Mention | Commercial and industrial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 9,268 12,465
Originated 17,260 13,275
Commercial | Special Mention | Lease financing
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 2,664 1,601
Commercial | Special Mention | Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 1,350 837
Commercial | Substandard
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 172,352 196,257
Commercial | Substandard | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 62,472 105,061
Originated 3,109 18,761
Commercial | Substandard | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 209,383 344,542
Originated 155,593 157,966
Commercial | Substandard | Other commercial real estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 13,786 44,335
Originated 3,709 5,038
Commercial | Substandard | Commercial and industrial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 5,908 14,698
Originated 6,606 12,073
Commercial | Substandard | Lease financing
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 3,335 1,663
Commercial | Substandard | Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 0 756
Commercial | Doubtful
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 9,032 16,336
Commercial | Doubtful | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 8,013 87,445
Originated 53 952
Commercial | Doubtful | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 49,165 73,016
Originated 6,703 13,475
Commercial | Doubtful | Other commercial real estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 8,713 11,696
Originated 75 98
Commercial | Doubtful | Commercial and industrial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,502 2,757
Originated 1,428 1,040
Commercial | Doubtful | Lease financing
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 773 771
Commercial | Doubtful | Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 0 0
Commercial | Ungraded
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 100,219 122,552
Commercial | Ungraded | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,710 2,656
Originated 0 331
Commercial | Ungraded | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 654 677
Originated 1,330 2,571
Commercial | Ungraded | Other commercial real estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 0 0
Originated 233 1,483
Commercial | Ungraded | Commercial and industrial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 217 92
Originated 98,656 117,144
Commercial | Ungraded | Lease financing
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 0 1,018
Commercial | Ungraded | Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 0 5
Noncommerical
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 273,410 359,200
Originated 3,542,485 3,581,620
Noncommerical | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 232,310 297,926
Originated 927,426 822,889
Noncommerical | Revolving mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 34,834 38,710
Originated 2,113,240 2,210,133
Noncommerical | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 5,337 20,793
Originated 121,553 131,992
Noncommerical | Consumer
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 929 1,771
Originated 380,266 416,606
Noncommerical | Consumer and Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,932 2,845
Noncommerical | Pass | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 145,735 172,165
Noncommerical | Pass | Revolving mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 26,291 29,540
Noncommerical | Pass | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 139 334
Noncommerical | Pass | Consumer and Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,468 1,617
Noncommerical | Special Mention | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 8,676 14,863
Noncommerical | Special Mention | Revolving mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,865 1,736
Noncommerical | Special Mention | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 0 0
Noncommerical | Special Mention | Consumer and Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 26 34
Noncommerical | Substandard | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 57,156 83,193
Noncommerical | Substandard | Revolving mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 3,329 7,434
Noncommerical | Substandard | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 4,903 17,190
Noncommerical | Substandard | Consumer and Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 0 239
Noncommerical | Doubtful | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,660 4,268
Noncommerical | Doubtful | Revolving mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,349 0
Noncommerical | Doubtful | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 295 3,269
Noncommerical | Doubtful | Consumer and Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 0 117
Noncommerical | Ungraded | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 18,083 23,437
Noncommerical | Ungraded | Revolving mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 0 0
Noncommerical | Ungraded | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 0 0
Noncommerical | Ungraded | Consumer and Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 438 838
Originated Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 11,779,490 11,441,555
Originated 11,884,585 11,576,115
30-59 Days Past Due 48,895 64,528
60-89 Days Past Due 17,735 19,620
90 Days or Greater 38,465 50,412
Originated Loans | Commercial | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 297,900 300,385
Originated 300,266 309,190
30-59 Days Past Due 1,755 927
60-89 Days Past Due 49 0
90 Days or Greater 562 7,878
Originated Loans | Commercial | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 6,263,304 5,979,482
Originated 6,308,192 6,029,435
30-59 Days Past Due 15,917 24,447
60-89 Days Past Due 10,522 4,179
90 Days or Greater 18,449 21,327
Originated Loans | Commercial | Other commercial real estate
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 175,927 158,319
Originated 177,599 160,980
30-59 Days Past Due 103 387
60-89 Days Past Due 400 1,240
90 Days or Greater 1,169 1,034
Originated Loans | Commercial | Commercial and industrial
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 1,004,537 1,033,996
Originated 1,009,641 1,038,530
30-59 Days Past Due 2,633 2,833
60-89 Days Past Due 796 1,096
90 Days or Greater 1,675 605
Originated Loans | Commercial | Lease financing
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 363,472 328,929
Originated 365,967 330,679
30-59 Days Past Due 2,317 991
60-89 Days Past Due 0 138
90 Days or Greater 178 621
Originated Loans | Commercial | Other
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 180,435 125,650
Originated 180,435 125,681
30-59 Days Past Due 0 18
60-89 Days Past Due 0 13
90 Days or Greater 0 0
Originated Loans | Noncommerical
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 3,493,915 3,514,794
Originated 3,542,485 3,581,620
30-59 Days Past Due 26,170 34,925
60-89 Days Past Due 5,968 12,954
90 Days or Greater 16,432 18,947
Originated Loans | Noncommerical | Mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 900,625 786,626
Originated 927,426 822,889
30-59 Days Past Due 11,840 15,711
60-89 Days Past Due 3,312 7,559
90 Days or Greater 11,649 12,993
Originated Loans | Noncommerical | Revolving mortgage
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 2,097,658 2,190,186
Originated 2,113,240 2,210,133
30-59 Days Past Due 9,921 12,868
60-89 Days Past Due 1,556 3,200
90 Days or Greater 4,105 3,879
Originated Loans | Noncommerical | Construction and land development
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 119,395 128,764
Originated 121,553 131,992
30-59 Days Past Due 1,907 1,941
60-89 Days Past Due 85 490
90 Days or Greater 166 797
Originated Loans | Noncommerical | Consumer
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 376,237 409,218
Originated 380,266 416,606
30-59 Days Past Due 2,502 4,405
60-89 Days Past Due 1,015 1,705
90 Days or Greater $ 512 $ 1,278
[1] Unaudited
[2] Derived from 2012 Annual Report on Form 10-K.