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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
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired $ 1,029,426 $ 1,809,235
Originated 12,104,298 11,576,115
Pass
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 492,831 650,661
Special Mention
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 155,750 331,614
Substandard
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 300,048 616,692
Doubtful
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 61,121 182,568
Ungraded
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 19,676 27,700
Commercial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 781,307 1,450,035
Originated 8,499,348 7,994,495
Commercial | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 78,915 237,906
Originated 319,847 309,190
Commercial | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 642,891 1,054,473
Originated 6,362,490 6,029,435
Commercial | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 41,381 107,119
Originated 178,754 160,980
Commercial | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 17,254 49,463
Originated 1,081,158 1,038,530
Commercial | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 381,763 330,679
Commercial | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 866 1,074
Originated 175,336 125,681
Commercial | Pass
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 8,092,174 7,459,277
Commercial | Pass | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,619 17,010
Originated 308,231 274,480
Commercial | Pass | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 296,824 376,974
Originated 6,094,505 5,688,541
Commercial | Pass | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 22,225 33,570
Originated 174,913 151,549
Commercial | Pass | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 8,021 19,451
Originated 964,840 894,998
Commercial | Pass | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 375,371 325,626
Commercial | Pass | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 174,314 124,083
Commercial | Special Mention
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 147,325 200,073
Commercial | Special Mention | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 15,530 25,734
Originated 8,620 14,666
Commercial | Special Mention | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 125,295 259,264
Originated 119,515 166,882
Commercial | Special Mention | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 3,431 17,518
Originated 1,362 2,812
Commercial | Special Mention | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,585 12,465
Originated 14,686 13,275
Commercial | Special Mention | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 2,160 1,601
Commercial | Special Mention | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 982 837
Commercial | Substandard
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 156,956 196,257
Commercial | Substandard | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 52,228 105,061
Originated 2,944 18,761
Commercial | Substandard | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 179,657 344,542
Originated 141,913 157,966
Commercial | Substandard | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 7,012 44,335
Originated 2,216 5,038
Commercial | Substandard | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 5,225 14,698
Originated 6,352 12,073
Commercial | Substandard | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 3,491 1,663
Commercial | Substandard | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 40 756
Commercial | Doubtful
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 6,022 16,336
Commercial | Doubtful | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 7,436 87,445
Originated 52 952
Commercial | Doubtful | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 40,471 73,016
Originated 5,159 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 1,257 2,757
Originated 144 1,040
Commercial | Doubtful | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 592 771
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 96,871 122,552
Commercial | Ungraded | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,102 2,656
Originated 0 331
Commercial | Ungraded | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 644 677
Originated 1,398 2,571
Commercial | Ungraded | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 0 0
Originated 188 1,483
Commercial | Ungraded | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 166 92
Originated 95,136 117,144
Commercial | Ungraded | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Originated 149 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 248,119 359,200
Originated 3,604,950 3,581,620
Noncommerical | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 213,851 297,926
Originated 982,421 822,889
Noncommerical | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 30,834 38,710
Originated 2,113,285 2,210,133
Noncommerical | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,583 20,793
Originated 122,792 131,992
Noncommerical | Consumer
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 851 1,771
Originated 386,452 416,606
Noncommerical | Consumer and Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,717 2,845
Noncommerical | Pass | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 135,326 172,165
Noncommerical | Pass | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 26,322 29,540
Noncommerical | Pass | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 149 334
Noncommerical | Pass | Consumer and Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,345 1,617
Noncommerical | Special Mention | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 6,301 14,863
Noncommerical | Special Mention | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,608 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 0 34
Noncommerical | Substandard | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 52,774 83,193
Noncommerical | Substandard | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,013 7,434
Noncommerical | Substandard | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,139 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 2,058 4,268
Noncommerical | Doubtful | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 891 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 17,392 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 372 838
Originated Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 12,015,067 11,441,555
Originated 12,104,298 11,576,115
30-59 Days Past Due 44,167 64,528
60-89 Days Past Due 14,236 19,620
90 Days or Greater 30,828 50,412
Originated Loans | Commercial | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 317,778 300,385
Originated 319,847 309,190
30-59 Days Past Due 1,603 927
60-89 Days Past Due 9 0
90 Days or Greater 457 7,878
Originated Loans | Commercial | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 6,333,351 5,979,482
Originated 6,362,490 6,029,435
30-59 Days Past Due 11,131 24,447
60-89 Days Past Due 3,601 4,179
90 Days or Greater 14,407 21,327
Originated Loans | Commercial | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 177,935 158,319
Originated 178,754 160,980
30-59 Days Past Due 139 387
60-89 Days Past Due 210 1,240
90 Days or Greater 470 1,034
Originated Loans | Commercial | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 1,076,704 1,033,996
Originated 1,081,158 1,038,530
30-59 Days Past Due 3,336 2,833
60-89 Days Past Due 682 1,096
90 Days or Greater 436 605
Originated Loans | Commercial | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 379,532 328,929
Originated 381,763 330,679
30-59 Days Past Due 789 991
60-89 Days Past Due 1,341 138
90 Days or Greater 101 621
Originated Loans | Commercial | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 175,251 125,650
Originated 175,336 125,681
30-59 Days Past Due 0 18
60-89 Days Past Due 85 13
90 Days or Greater 0 0
Originated Loans | Noncommerical
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 3,554,516 3,514,794
Originated 3,604,950 3,581,620
30-59 Days Past Due 27,169 34,925
60-89 Days Past Due 8,308 12,954
90 Days or Greater 14,957 18,947
Originated Loans | Noncommerical | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 955,300 786,626
Originated 982,421 822,889
30-59 Days Past Due 12,885 15,711
60-89 Days Past Due 4,658 7,559
90 Days or Greater 9,578 12,993
Originated Loans | Noncommerical | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 2,095,480 2,190,186
Originated 2,113,285 2,210,133
30-59 Days Past Due 10,977 12,868
60-89 Days Past Due 2,378 3,200
90 Days or Greater 4,450 3,879
Originated Loans | Noncommerical | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 121,026 128,764
Originated 122,792 131,992
30-59 Days Past Due 1,193 1,941
60-89 Days Past Due 317 490
90 Days or Greater 256 797
Originated Loans | Noncommerical | Consumer
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 382,710 409,218
Originated 386,452 416,606
30-59 Days Past Due 2,114 4,405
60-89 Days Past Due 955 1,705
90 Days or Greater $ 673 $ 1,278