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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans $ 1,123,239 $ 1,186,498 $ 1,109,933 $ 1,029,426
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 11,878,443 11,205,639    
PCI loans 697,045 726,123    
Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 7,861,590 7,552,948    
PCI loans 611,505 577,518    
Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 288,214 244,875    
PCI loans 14,353 40,193    
Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,199,591 1,988,934    
PCI loans 20,382 27,254    
Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 643,508 571,916    
Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 338,389 353,833    
PCI loans 2,597 3,079    
Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 547,151 493,133    
PCI loans 48,208 78,079    
Commercial | Pass        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 11,450,784 10,773,986    
PCI loans 363,305 342,172    
Commercial | Pass | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 7,613,114 7,284,714    
PCI loans 324,320 300,187    
Commercial | Pass | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 285,339 242,053    
PCI loans 8,456 11,033    
Commercial | Pass | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,050,360 1,859,415    
PCI loans 11,681 16,637    
Commercial | Pass | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 635,084 564,319    
Commercial | Pass | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 334,601 349,111    
PCI loans 796 801    
Commercial | Pass | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 532,286 474,374    
PCI loans 18,052 13,514    
Commercial | Special Mention        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 139,942 176,355    
PCI loans 105,062 125,195    
Commercial | Special Mention | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 102,773 129,247    
PCI loans 100,609 98,724    
Commercial | Special Mention | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 267 909    
PCI loans 13 16,271    
Commercial | Special Mention | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 17,861 27,683    
PCI loans 1,934 4,137    
Commercial | Special Mention | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 4,797 3,205    
Commercial | Special Mention | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,859 1,384    
PCI loans 0 0    
Commercial | Special Mention | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 12,385 13,927    
PCI loans 2,506 6,063    
Commercial | Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 166,129 157,333    
PCI loans 207,640 247,138    
Commercial | Substandard | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 141,061 134,677    
PCI loans 172,577 171,920    
Commercial | Substandard | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,043 1,765    
PCI loans 5,549 12,889    
Commercial | Substandard | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 16,471 8,878    
PCI loans 5,796 6,312    
Commercial | Substandard | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,294 3,955    
Commercial | Substandard | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,929 3,338    
PCI loans 1,801 2,278    
Commercial | Substandard | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,331 4,720    
PCI loans 21,917 53,739    
Commercial | Doubtful        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 4,211 2,895    
PCI loans 18,219 9,241    
Commercial | Doubtful | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,553 2,366    
PCI loans 13,571 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 2,333 164    
PCI loans 307 130    
Commercial | Doubtful | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 325 365    
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 4,341 2,809    
Commercial | Ungraded        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 117,377 95,070    
PCI loans 2,819 2,377    
Commercial | Ungraded | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,089 1,944    
PCI loans 428 385    
Commercial | Ungraded | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,565 148    
PCI loans 335 0    
Commercial | Ungraded | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 112,566 92,794    
PCI loans 664 38    
Commercial | Ungraded | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 8 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 149 112    
PCI loans 1,392 1,954    
Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 426,194 460,375    
Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 358,307 382,340    
Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 345 912    
Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 64,340 74,109    
Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 3,202 3,014    
Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 18,396,946 17,582,967    
Past due loans 106,866 101,467    
Current loans 18,290,080 17,481,500    
Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 7,861,590 7,552,948    
Past due loans 31,475 24,210    
Current loans 7,830,115 7,528,738    
Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 288,214 244,875    
Past due loans 237 378    
Current loans 287,977 244,497    
Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,199,591 1,988,934    
Past due loans 8,335 4,766    
Current loans 2,191,256 1,984,168    
Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 643,508 571,916    
Past due loans 1,559 1,641    
Current loans 641,949 570,275    
Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 338,389 353,833    
Past due loans 548 2,112    
Current loans 337,841 351,721    
Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 547,151 493,133    
Past due loans 3,165 1,133    
Current loans 543,986 492,000    
Non-PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 6,518,503 6,377,328    
Current loans 6,456,956 6,310,101    
Non-PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,597,064 2,493,058    
Past due loans 37,190 38,261    
Current loans 2,559,874 2,454,797    
Non-PCI Loans | Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 227,280 205,016    
Past due loans 2,504 2,672    
Current loans 224,776 202,344    
Non-PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,529,936 2,561,800    
Past due loans 13,778 18,993    
Current loans 2,516,158 2,542,807    
Non-PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,164,223 1,117,454    
Past due loans 8,075 7,301    
Current loans 1,156,148 1,110,153    
PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 1,123,239 1,186,498    
PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 372,625 398,225    
PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 311,880 326,589    
PCI Loans | Noncommerical | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 314 506    
PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 57,529 68,548    
PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 2,902 2,582    
90 Days or greater | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 33,198 24,598    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 14,676 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 188 102    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,050 378    
90 Days or greater | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 308 2    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 210 0    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 921 330    
90 Days or greater | Non-PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 15,845 15,725    
90 Days or greater | Non-PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 9,033 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 493 202    
90 Days or greater | Non-PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,232 5,463    
90 Days or greater | Non-PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,087 1,105    
90 Days or greater | PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 33,483 38,723    
90 Days or greater | PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 31,110 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 2,230 3,811    
90 Days or greater | PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 143 260    
60 to 89 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 17,416 19,548    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,896 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 0 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 1,010 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 90 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 612 283    
60 to 89 Days past due | Non-PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 10,808 10,894    
60 to 89 Days past due | Non-PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 6,039 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 469 824    
60 to 89 Days past due | Non-PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,372 2,433    
60 to 89 Days past due | Non-PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,928 1,619    
60 to 89 Days past due | PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,074 10,443    
60 to 89 Days past due | PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,882 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 147 345    
60 to 89 Days past due | PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 45 25    
30 to 59 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 56,252 57,321    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 11,903 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 49 206    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 6,275 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 1,161 1,631    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 338 146    
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 1,632 520    
30 to 59 Days past due | Non-PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 34,894 40,608    
30 to 59 Days past due | Non-PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 22,118 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 1,542 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 6,174 11,097    
30 to 59 Days past due | Non-PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,060 4,577    
30 to 59 Days past due | PCI Loans | Noncommerical        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 16,012 12,984    
30 to 59 Days past due | PCI Loans | Noncommerical | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 11,435 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 31 0    
30 to 59 Days past due | PCI Loans | Noncommerical | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,434 1,405    
30 to 59 Days past due | PCI Loans | Noncommerical | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans $ 112 $ 147