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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans $ 1,044,064 $ 1,186,498 $ 996,280 $ 1,029,426
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 12,219,444 11,205,639    
PCI loans 646,961 726,123    
Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 8,076,946 7,552,948    
PCI loans 568,256 577,518    
Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 316,924 244,875    
PCI loans 18,013 40,193    
Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,211,973 1,988,934    
PCI loans 17,023 27,254    
Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 691,915 571,916    
Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 357,760 353,833    
PCI loans 2,087 3,079    
Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 563,926 493,133    
PCI loans 41,582 78,079    
Commercial | Pass        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 11,799,765 10,773,986    
PCI loans 341,122 342,172    
Commercial | Pass | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 7,821,706 7,284,714    
PCI loans 302,848 300,187    
Commercial | Pass | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 314,171 242,053    
PCI loans 8,519 11,033    
Commercial | Pass | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,070,568 1,859,415    
PCI loans 10,744 16,637    
Commercial | Pass | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 683,265 564,319    
Commercial | Pass | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 354,222 349,111    
PCI loans 775 801    
Commercial | Pass | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 555,833 474,374    
PCI loans 18,236 13,514    
Commercial | Special Mention        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 137,482 176,355    
PCI loans 98,667 125,195    
Commercial | Special Mention | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 107,790 129,247    
PCI loans 94,955 98,724    
Commercial | Special Mention | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 285 909    
PCI loans 0 16,271    
Commercial | Special Mention | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 16,812 27,683    
PCI loans 1,462 4,137    
Commercial | Special Mention | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 5,161 3,205    
Commercial | Special Mention | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,828 1,384    
PCI loans 0 0    
Commercial | Special Mention | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 5,606 13,927    
PCI loans 2,250 6,063    
Commercial | Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 167,147 157,333    
PCI loans 190,709 247,138    
Commercial | Substandard | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 143,536 134,677    
PCI loans 159,148 171,920    
Commercial | Substandard | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,010 1,765    
PCI loans 9,048 12,889    
Commercial | Substandard | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 15,241 8,878    
PCI loans 4,395 6,312    
Commercial | Substandard | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,163 3,955    
Commercial | Substandard | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,710 3,338    
PCI loans 1,312 2,278    
Commercial | Substandard | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,487 4,720    
PCI loans 16,806 53,739    
Commercial | Doubtful        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,517 2,895    
PCI loans 15,549 9,241    
Commercial | Doubtful | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 647 2,366    
PCI loans 10,967 6,302    
Commercial | Doubtful | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
PCI loans 0 0    
Commercial | Doubtful | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,544 164    
PCI loans 292 130    
Commercial | Doubtful | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 326 365    
Commercial | Doubtful | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
PCI loans 0 0    
Commercial | Doubtful | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
PCI loans 4,290 2,809    
Commercial | Ungraded        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 112,533 95,070    
PCI loans 914 2,377    
Commercial | Ungraded | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,267 1,944    
PCI loans 338 385    
Commercial | Ungraded | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,458 148    
PCI loans 446 0    
Commercial | Ungraded | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 107,808 92,794    
PCI loans 130 38    
Commercial | Ungraded | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 72    
Commercial | Ungraded | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
PCI loans 0 0    
Commercial | Ungraded | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 112    
PCI loans 0 1,954    
Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 397,103 460,375    
Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 334,518 382,340    
Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 347 912    
Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 59,695 74,109    
Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 2,543 3,014    
Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 18,811,742 17,582,967    
Past due loans 126,620 101,467    
Current loans 18,685,122 17,481,500    
Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 8,076,946 7,552,948    
Past due loans 40,900 24,210    
Current loans 8,036,046 7,528,738    
Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 316,924 244,875    
Past due loans 852 378    
Current loans 316,072 244,497    
Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,211,973 1,988,934    
Past due loans 7,781 4,766    
Current loans 2,204,192 1,984,168    
Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 691,915 571,916    
Past due loans 877 1,641    
Current loans 691,038 570,275    
Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 357,760 353,833    
Past due loans 195 2,112    
Current loans 357,565 351,721    
Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 563,926 493,133    
Past due loans 1,867 1,133    
Current loans 562,059 492,000    
Non-PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 6,592,298 6,377,328    
Current loans 6,518,150 6,310,101    
Non-PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,659,821 2,493,058    
Past due loans 43,867 38,261    
Current loans 2,615,954 2,454,797    
Non-PCI Loans | Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 220,493 205,016    
Past due loans 3,757 2,672    
Current loans 216,736 202,344    
Non-PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,519,972 2,561,800    
Past due loans 16,222 18,993    
Current loans 2,503,750 2,542,807    
Non-PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,192,012 1,117,454    
Past due loans 10,302 7,301    
Current loans 1,181,710 1,110,153    
PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 1,044,064 1,186,498    
PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 343,665 398,225    
PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 286,402 326,589    
PCI Loans | Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 347 506    
PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 54,594 68,548    
PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 2,322 2,582    
90 Days or greater | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 41,880 24,598    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 21,416 8,061    
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 159 102    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,328 378    
90 Days or greater | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 310 2    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 184 0    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 282 330    
90 Days or greater | Non-PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 18,201 15,725    
90 Days or greater | Non-PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 12,048 8,955    
90 Days or greater | Non-PCI Loans | Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 576 202    
90 Days or greater | Non-PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,255 5,463    
90 Days or greater | Non-PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,322 1,105    
90 Days or greater | PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 31,059 38,723    
90 Days or greater | PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 27,499 34,246    
90 Days or greater | PCI Loans | Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 406    
90 Days or greater | PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,560 3,811    
90 Days or greater | PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 260    
60 to 89 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 18,987 19,548    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,897 4,782    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 290 70    
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 961 1,545    
60 to 89 Days past due | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 169 8    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 1,966    
60 to 89 Days past due | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 266 283    
60 to 89 Days past due | Non-PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 12,404 10,894    
60 to 89 Days past due | Non-PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 7,640 6,018    
60 to 89 Days past due | Non-PCI Loans | Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 642 824    
60 to 89 Days past due | Non-PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,031 2,433    
60 to 89 Days past due | Non-PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,091 1,619    
60 to 89 Days past due | PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 6,541 10,443    
60 to 89 Days past due | PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 6,103 10,073    
60 to 89 Days past due | PCI Loans | Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 0    
60 to 89 Days past due | PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 307 345    
60 to 89 Days past due | PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 131 25    
30 to 59 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 65,753 57,321    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 14,587 11,367    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 403 206    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,492 2,843    
30 to 59 Days past due | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 398 1,631    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 11 146    
30 to 59 Days past due | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,319 520    
30 to 59 Days past due | Non-PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 43,543 40,608    
30 to 59 Days past due | Non-PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 24,179 23,288    
30 to 59 Days past due | Non-PCI Loans | Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,539 1,646    
30 to 59 Days past due | Non-PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 9,936 11,097    
30 to 59 Days past due | Non-PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 6,889 4,577    
30 to 59 Days past due | PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 15,838 12,984    
30 to 59 Days past due | PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 14,514 11,432    
30 to 59 Days past due | PCI Loans | Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 0    
30 to 59 Days past due | PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,234 1,405    
30 to 59 Days past due | PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans $ 90 $ 147