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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, 2014 | Dec. 31, 2013
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | $ 996,280 | $ 1,029,426
Total Originated Loans and Leases | 12,806,511 | 12,104,298
Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 513,160 | 492,831
Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 135,179 | 155,750
Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 232,756 | 300,048
Doubtful |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 17,686 | 61,121
Ungraded |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 97,499 | 19,676
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 702,761 | 781,307
Total Originated Loans and Leases | 9,052,309 | 8,499,348
Commercial | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 59,808 | 78,915
Total Originated Loans and Leases | 382,775 | 319,847
Commercial | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 579,435 | 642,891
Total Originated Loans and Leases | 6,475,366 | 6,362,490
Commercial | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 36,043 | 41,381
Total Originated Loans and Leases | 177,681 | 178,754
Commercial | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 25,813 | 17,254
Total Originated Loans and Leases | 1,359,945 | 1,081,158
Commercial | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 443,318 | 381,763
Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 1,662 | 866
Total Originated Loans and Leases | 213,224 | 175,336
Commercial | Pass |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 8,666,445 | 8,092,174
Commercial | Pass | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 7,883 | 2,619
Total Originated Loans and Leases | 371,835 | 308,231
Commercial | Pass | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 318,221 | 296,824
Total Originated Loans and Leases | 6,218,527 | 6,094,505
Commercial | Pass | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 11,249 | 22,225
Total Originated Loans and Leases | 174,039 | 174,913
Commercial | Pass | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 20,208 | 8,021
Total Originated Loans and Leases | 1,253,945 | 964,840
Commercial | Pass | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 434,915 | 375,371
Commercial | Pass | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 213,184 | 174,314
Commercial | Special Mention |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 143,846 | 147,325
Commercial | Special Mention | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 5,669 | 15,530
Total Originated Loans and Leases | 6,028 | 8,620
Commercial | Special Mention | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 103,276 | 125,295
Total Originated Loans and Leases | 112,342 | 119,515
Commercial | Special Mention | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 16,005 | 3,431
Total Originated Loans and Leases | 889 | 1,362
Commercial | Special Mention | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 2,685 | 2,585
Total Originated Loans and Leases | 19,804 | 14,686
Commercial | Special Mention | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 4,783 | 2,160
Commercial | Special Mention | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 0 | 982
Commercial | Substandard |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 156,910 | 156,956
Commercial | Substandard | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 40,876 | 52,228
Total Originated Loans and Leases | 4,912 | 2,944
Commercial | Substandard | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 144,810 | 179,657
Total Originated Loans and Leases | 140,703 | 141,913
Commercial | Substandard | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 8,789 | 7,012
Total Originated Loans and Leases | 2,590 | 2,216
Commercial | Substandard | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 2,767 | 5,225
Total Originated Loans and Leases | 5,461 | 6,352
Commercial | Substandard | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 3,204 | 3,491
Commercial | Substandard | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 40 | 40
Commercial | Doubtful |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 2,912 | 6,022
Commercial | Doubtful | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 2,766 | 7,436
Total Originated Loans and Leases | 0 | 52
Commercial | Doubtful | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 12,737 | 40,471
Total Originated Loans and Leases | 2,494 | 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 | 153 | 1,257
Total Originated Loans and Leases | 19 | 144
Commercial | Doubtful | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 399 | 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 | 82,196 | 96,871
Commercial | Ungraded | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 2,614 | 1,102
Total Originated Loans and Leases | 0 | 0
Commercial | Ungraded | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 391 | 644
Total Originated Loans and Leases | 1,300 | 1,398
Commercial | Ungraded | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 0 | 0
Total Originated Loans and Leases | 163 | 188
Commercial | Ungraded | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 0 | 166
Total Originated Loans and Leases | 80,716 | 95,136
Commercial | Ungraded | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Originated Loans and Leases | 17 | 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 | 293,519 | 248,119
Total Originated Loans and Leases | 3,754,202 | 3,604,950
Noncommerical | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 240,681 | 213,851
Total Originated Loans and Leases | 1,141,049 | 982,421
Noncommerical | Revolving mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 50,048 | 30,834
Total Originated Loans and Leases | 2,120,167 | 2,113,285
Noncommerical | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 1,144 | 2,583
Total Originated Loans and Leases | 117,209 | 122,792
Noncommerical | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 1,646 | 851
Total Originated Loans and Leases | 375,777 | 386,452
Noncommerical | Consumer and Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 3,308 | 1,717
Noncommerical | Pass | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 131,302 | 135,326
Noncommerical | Pass | Revolving mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 22,811 | 26,322
Noncommerical | Pass | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 70 | 149
Noncommerical | Pass | Consumer and Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 1,416 | 1,345
Noncommerical | Special Mention | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 4,148 | 6,301
Noncommerical | Special Mention | Revolving mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 3,396 | 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 | 32,636 | 52,774
Noncommerical | Substandard | Revolving mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 2,588 | 1,013
Noncommerical | Substandard | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 50 | 2,139
Noncommerical | Substandard | Consumer and Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 240 | 0
Noncommerical | Doubtful | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 771 | 2,058
Noncommerical | Doubtful | Revolving mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 965 | 891
Noncommerical | Doubtful | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 294 | 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 | 71,824 | 17,392
Noncommerical | Ungraded | Revolving mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 20,288 | 0
Noncommerical | Ungraded | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 730 | 0
Noncommerical | Ungraded | Consumer and Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Acquired | 1,652 | 372
Originated Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 12,719,948 | 12,015,067
Total Originated Loans and Leases | 12,806,511 | 12,104,298
30-59 Days Past Due | 48,389 | 44,167
60-89 Days Past Due | 11,961 | 14,236
90 Days or Greater | 26,213 | 30,828
Originated Loans | Commercial | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 382,070 | 317,778
Total Originated Loans and Leases | 382,775 | 319,847
30-59 Days Past Due | 379 | 1,603
60-89 Days Past Due | 13 | 9
90 Days or Greater | 313 | 457
Originated Loans | Commercial | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 6,448,484 | 6,333,351
Total Originated Loans and Leases | 6,475,366 | 6,362,490
30-59 Days Past Due | 11,337 | 11,131
60-89 Days Past Due | 4,536 | 3,601
90 Days or Greater | 11,009 | 14,407
Originated Loans | Commercial | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 176,806 | 177,935
Total Originated Loans and Leases | 177,681 | 178,754
30-59 Days Past Due | 808 | 139
60-89 Days Past Due | 67 | 210
90 Days or Greater | 0 | 470
Originated Loans | Commercial | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 1,353,100 | 1,076,704
Total Originated Loans and Leases | 1,359,945 | 1,081,158
30-59 Days Past Due | 5,366 | 3,336
60-89 Days Past Due | 634 | 682
90 Days or Greater | 845 | 436
Originated Loans | Commercial | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 441,956 | 379,532
Total Originated Loans and Leases | 443,318 | 381,763
30-59 Days Past Due | 527 | 789
60-89 Days Past Due | 322 | 1,341
90 Days or Greater | 513 | 101
Originated Loans | Commercial | Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 213,224 | 175,251
Total Originated Loans and Leases | 213,224 | 175,336
30-59 Days Past Due | 0 | 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 | 3,704,308 | 3,554,516
Total Originated Loans and Leases | 3,754,202 | 3,604,950
30-59 Days Past Due | 29,972 | 27,169
60-89 Days Past Due | 6,389 | 8,308
90 Days or Greater | 13,533 | 14,957
Originated Loans | Noncommerical | Mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 1,111,371 | 955,300
Total Originated Loans and Leases | 1,141,049 | 982,421
30-59 Days Past Due | 18,528 | 12,885
60-89 Days Past Due | 3,380 | 4,658
90 Days or Greater | 7,770 | 9,578
Originated Loans | Noncommerical | Revolving mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 2,104,212 | 2,095,480
Total Originated Loans and Leases | 2,120,167 | 2,113,285
30-59 Days Past Due | 8,941 | 10,977
60-89 Days Past Due | 2,064 | 2,378
90 Days or Greater | 4,950 | 4,450
Originated Loans | Noncommerical | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 116,377 | 121,026
Total Originated Loans and Leases | 117,209 | 122,792
30-59 Days Past Due | 458 | 1,193
60-89 Days Past Due | 117 | 317
90 Days or Greater | 257 | 256
Originated Loans | Noncommerical | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Current | 372,348 | 382,710
Total Originated Loans and Leases | 375,777 | 386,452
30-59 Days Past Due | 2,045 | 2,114
60-89 Days Past Due | 828 | 955
90 Days or Greater | $ 556 | $ 673

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