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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
Jun. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired $ 1,109,933 $ 1,029,426
Total Originated Loans and Leases 12,415,023 12,104,298
Pass
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 556,592 492,831
Special Mention
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 145,340 155,750
Substandard
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 256,430 300,048
Doubtful
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 37,456 61,121
Ungraded
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 114,115 19,676
Commercial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 788,117 781,307
Total Originated Loans and Leases 8,724,702 8,499,348
Commercial | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 80,827 78,915
Total Originated Loans and Leases 342,021 319,847
Commercial | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 637,481 642,891
Total Originated Loans and Leases 6,367,096 6,362,490
Commercial | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 34,688 41,381
Total Originated Loans and Leases 178,899 178,754
Commercial | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 33,851 17,254
Total Originated Loans and Leases 1,292,213 1,081,158
Commercial | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 413,422 381,763
Commercial | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,270 866
Total Originated Loans and Leases 131,051 175,336
Commercial | Pass
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 8,323,194 8,092,174
Commercial | Pass | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 14,193 2,619
Total Originated Loans and Leases 330,946 308,231
Commercial | Pass | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 349,009 296,824
Total Originated Loans and Leases 6,102,219 6,094,505
Commercial | Pass | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 11,422 22,225
Total Originated Loans and Leases 175,413 174,913
Commercial | Pass | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 26,313 8,021
Total Originated Loans and Leases 1,178,124 964,840
Commercial | Pass | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 405,495 375,371
Commercial | Pass | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 130,997 174,314
Commercial | Special Mention
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 161,033 147,325
Commercial | Special Mention | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 10,957 15,530
Total Originated Loans and Leases 7,901 8,620
Commercial | Special Mention | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 106,582 125,295
Total Originated Loans and Leases 121,824 119,515
Commercial | Special Mention | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 16,014 3,431
Total Originated Loans and Leases 1,370 1,362
Commercial | Special Mention | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 3,869 2,585
Total Originated Loans and Leases 25,606 14,686
Commercial | Special Mention | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 4,324 2,160
Commercial | Special Mention | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 8 982
Commercial | Substandard
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 153,233 156,956
Commercial | Substandard | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 49,746 52,228
Total Originated Loans and Leases 3,174 2,944
Commercial | Substandard | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 148,880 179,657
Total Originated Loans and Leases 138,451 141,913
Commercial | Substandard | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 7,252 7,012
Total Originated Loans and Leases 1,966 2,216
Commercial | Substandard | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 3,221 5,225
Total Originated Loans and Leases 6,474 6,352
Commercial | Substandard | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 3,122 3,491
Commercial | Substandard | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 46 40
Commercial | Doubtful
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 4,237 6,022
Commercial | Doubtful | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,214 7,436
Total Originated Loans and Leases 0 52
Commercial | Doubtful | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 32,503 40,471
Total Originated Loans and Leases 3,296 5,159
Commercial | Doubtful | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 0 8,713
Total Originated Loans and Leases 0 75
Commercial | Doubtful | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 431 1,257
Total Originated Loans and Leases 460 144
Commercial | Doubtful | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 481 592
Commercial | Doubtful | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 0 0
Commercial | Ungraded
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 83,005 96,871
Commercial | Ungraded | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 3,717 1,102
Total Originated Loans and Leases 0 0
Commercial | Ungraded | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 507 644
Total Originated Loans and Leases 1,306 1,398
Commercial | Ungraded | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 0 0
Total Originated Loans and Leases 150 188
Commercial | Ungraded | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 17 166
Total Originated Loans and Leases 81,549 95,136
Commercial | Ungraded | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 0 149
Commercial | Ungraded | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Originated Loans and Leases 0 0
Noncommerical
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 321,816 248,119
Total Originated Loans and Leases 3,690,321 3,604,950
Noncommerical | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 270,688 213,851
Total Originated Loans and Leases 1,071,089 982,421
Noncommerical | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 20,129 30,834
Total Originated Loans and Leases 2,122,675 2,113,285
Noncommerical | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 28,759 2,583
Total Originated Loans and Leases 119,420 122,792
Noncommerical | Consumer
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,240 851
Total Originated Loans and Leases 377,137 386,452
Noncommerical | Consumer and Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 3,510 1,717
Noncommerical | Pass | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 138,836 135,326
Noncommerical | Pass | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 15,238 26,322
Noncommerical | Pass | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 112 149
Noncommerical | Pass | Consumer and Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,469 1,345
Noncommerical | Special Mention | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 5,543 6,301
Noncommerical | Special Mention | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,375 2,608
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 0
Noncommerical | Substandard | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 44,396 52,774
Noncommerical | Substandard | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,696 1,013
Noncommerical | Substandard | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,237 2,139
Noncommerical | Substandard | Consumer and Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2 0
Noncommerical | Doubtful | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 1,401 2,058
Noncommerical | Doubtful | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 612 891
Noncommerical | Doubtful | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 295 295
Noncommerical | Doubtful | Consumer and Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 0 0
Noncommerical | Ungraded | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 80,512 17,392
Noncommerical | Ungraded | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 208 0
Noncommerical | Ungraded | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 27,115 0
Noncommerical | Ungraded | Consumer and Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Acquired 2,039 372
Originated Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 12,336,398 12,015,067
Total Originated Loans and Leases 12,415,023 12,104,298
30-59 Days Past Due 41,280 44,167
60-89 Days Past Due 12,141 14,236
90 Days or Greater 25,204 30,828
Originated Loans | Commercial | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 340,862 317,778
Total Originated Loans and Leases 342,021 319,847
30-59 Days Past Due 657 1,603
60-89 Days Past Due 40 9
90 Days or Greater 462 457
Originated Loans | Commercial | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 6,341,751 6,333,351
Total Originated Loans and Leases 6,367,096 6,362,490
30-59 Days Past Due 11,755 11,131
60-89 Days Past Due 3,089 3,601
90 Days or Greater 10,501 14,407
Originated Loans | Commercial | Other commercial real estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 178,698 177,935
Total Originated Loans and Leases 178,899 178,754
30-59 Days Past Due 149 139
60-89 Days Past Due 0 210
90 Days or Greater 52 470
Originated Loans | Commercial | Commercial and industrial
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 1,285,356 1,076,704
Total Originated Loans and Leases 1,292,213 1,081,158
30-59 Days Past Due 5,459 3,336
60-89 Days Past Due 805 682
90 Days or Greater 593 436
Originated Loans | Commercial | Lease financing
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 412,207 379,532
Total Originated Loans and Leases 413,422 381,763
30-59 Days Past Due 1,110 789
60-89 Days Past Due 8 1,341
90 Days or Greater 97 101
Originated Loans | Commercial | Other
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 130,708 175,251
Total Originated Loans and Leases 131,051 175,336
30-59 Days Past Due 343 0
60-89 Days Past Due 0 85
90 Days or Greater 0 0
Originated Loans | Noncommerical
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 3,646,816 3,554,516
Total Originated Loans and Leases 3,690,321 3,604,950
30-59 Days Past Due 21,807 27,169
60-89 Days Past Due 8,199 8,308
90 Days or Greater 13,499 14,957
Originated Loans | Noncommerical | Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 1,047,270 955,300
Total Originated Loans and Leases 1,071,089 982,421
30-59 Days Past Due 11,219 12,885
60-89 Days Past Due 4,693 4,658
90 Days or Greater 7,907 9,578
Originated Loans | Noncommerical | Revolving mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 2,107,889 2,095,480
Total Originated Loans and Leases 2,122,675 2,113,285
30-59 Days Past Due 7,690 10,977
60-89 Days Past Due 2,434 2,378
90 Days or Greater 4,662 4,450
Originated Loans | Noncommerical | Construction and land development
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 118,078 121,026
Total Originated Loans and Leases 119,420 122,792
30-59 Days Past Due 949 1,193
60-89 Days Past Due 229 317
90 Days or Greater 164 256
Originated Loans | Noncommerical | Consumer
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 373,579 382,710
Total Originated Loans and Leases 377,137 386,452
30-59 Days Past Due 1,949 2,114
60-89 Days Past Due 843 955
90 Days or Greater $ 766 $ 673