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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans $ 921,467 $ 950,516 $ 1,123,239 $ 1,186,498
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 13,003,972 12,630,489    
PCI loans 576,942 593,614    
Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 8,505,259 8,274,548    
PCI loans 513,021 525,468    
Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 337,618 321,021    
PCI loans 20,166 17,076    
Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,386,159 2,368,958    
PCI loans 12,854 15,182    
Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 784,861 730,778    
Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 365,269 314,832    
PCI loans 3,159 2,008    
Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 624,806 620,352    
PCI loans 27,742 33,880    
Commercial | Pass        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 12,597,642 12,204,677    
PCI loans 318,728 294,663    
Commercial | Pass | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 8,269,622 8,024,831    
PCI loans 285,428 262,579    
Commercial | Pass | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 333,803 318,187    
PCI loans 9,314 7,366    
Commercial | Pass | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,232,669 2,219,606    
PCI loans 9,090 9,302    
Commercial | Pass | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 776,827 719,338    
Commercial | Pass | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 363,096 311,401    
PCI loans 2,110 706    
Commercial | Pass | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 621,625 611,314    
PCI loans 12,786 14,710    
Commercial | Special Mention        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 112,940 132,021    
PCI loans 82,131 89,625    
Commercial | Special Mention | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 90,904 100,220    
PCI loans 80,009 87,870    
Commercial | Special Mention | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,723 475    
PCI loans 1,025 60    
Commercial | Special Mention | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 15,088 19,361    
PCI loans 418 937    
Commercial | Special Mention | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,759 4,869    
Commercial | Special Mention | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,310 1,905    
PCI loans 0 0    
Commercial | Special Mention | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,156 5,191    
PCI loans 679 758    
Commercial | Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 168,567 180,100    
PCI loans 159,909 193,051    
Commercial | Substandard | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 141,708 146,071    
PCI loans 135,925 163,801    
Commercial | Substandard | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 918 959    
PCI loans 8,599 9,229    
Commercial | Substandard | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 17,869 21,322    
PCI loans 3,023 4,588    
Commercial | Substandard | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 5,184 6,375    
Commercial | Substandard | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 863 1,526    
PCI loans 1,049 1,302    
Commercial | Substandard | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,025 3,847    
PCI loans 11,313 14,131    
Commercial | Doubtful        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 484 1,176    
PCI loans 15,541 15,438    
Commercial | Doubtful | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 424 599    
PCI loans 11,340 10,875    
Commercial | Doubtful | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 0 0    
PCI loans 982 0    
Commercial | Doubtful | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 16 408    
PCI loans 255 282    
Commercial | Doubtful | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 44 169    
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 2,964 4,281    
Commercial | Ungraded        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 124,339 112,515    
PCI loans 633 837    
Commercial | Ungraded | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,601 2,827    
PCI loans 319 343    
Commercial | Ungraded | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,174 1,400    
PCI loans 246 421    
Commercial | Ungraded | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 120,517 108,261    
PCI loans 68 73    
Commercial | Ungraded | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 47 27    
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 0    
PCI loans 0 0    
Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 344,525 356,902    
Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 294,625 302,158    
Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 467 0    
Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 47,230 52,471    
Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 2,203 2,273    
Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 19,821,104 19,289,474    
Past due loans 110,432 121,576    
Current loans 19,710,672 19,167,898    
Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 8,505,259 8,274,548    
Past due loans 26,020 30,964    
Current loans 8,479,239 8,243,584    
Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 337,618 321,021    
Past due loans 1,240 1,026    
Current loans 336,378 319,995    
Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,386,159 2,368,958    
Past due loans 9,787 4,992    
Current loans 2,376,372 2,363,966    
Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 784,861 730,778    
Past due loans 1,570 2,236    
Current loans 783,291 728,542    
Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 365,269 314,832    
Past due loans 723 301    
Current loans 364,546 314,531    
Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 624,806 620,352    
Past due loans 712 1,733    
Current loans 624,094 618,619    
Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 6,817,132 6,658,985    
Current loans 6,746,752 6,578,661    
Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,777,863 2,695,985    
Past due loans 42,022 44,776    
Current loans 2,735,841 2,651,209    
Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 226,322 220,073    
Past due loans 2,851 5,518    
Current loans 223,471 214,555    
Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,533,528 2,523,106    
Past due loans 16,495 21,041    
Current loans 2,517,033 2,502,065    
Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,279,419 1,219,821    
Past due loans 9,012 8,989    
Current loans 1,270,407 1,210,832    
PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 921,467 950,516    
PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 296,783 307,089    
PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 252,675 257,207    
PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 467 0    
PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 41,655 47,901    
PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 1,986 1,981    
90 Days or greater | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 38,224 39,349    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 10,896 14,495    
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 27 142    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,169 1,780    
90 Days or greater | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 368 164    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 397 134    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 295 463    
90 Days or greater | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 24,072 22,171    
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 15,160 13,280    
90 Days or greater | Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,554 1,638    
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,963 5,631    
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,395 1,622    
90 Days or greater | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 30,225 31,208    
90 Days or greater | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 26,281 28,192    
90 Days or greater | PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 0    
90 Days or greater | PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,894 2,942    
90 Days or greater | PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 50 74    
60 to 89 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 17,800 18,705    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 6,026 3,446    
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 99 0    
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 896 1,079    
60 to 89 Days past due | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 106 2    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 142 164    
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 188 283    
60 to 89 Days past due | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 10,343 13,731    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,545 7,536    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 278 669    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,476 3,704    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,044 1,822    
60 to 89 Days past due | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,057 5,074    
60 to 89 Days past due | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,654 4,441    
60 to 89 Days past due | PCI Loans | Noncommercial | 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 | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 358 501    
60 to 89 Days past due | PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 45 132    
30 to 59 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 54,408 63,522    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 9,098 13,023    
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 1,114 884    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 6,722 2,133    
30 to 59 Days past due | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,096 2,070    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 184 3    
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 229 987    
30 to 59 Days past due | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 35,965 44,422    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 21,317 23,960    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,019 3,211    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 8,056 11,706    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,573 5,545    
30 to 59 Days past due | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 12,460 13,531    
30 to 59 Days past due | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 11,015 12,318    
30 to 59 Days past due | PCI Loans | Noncommercial | 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 | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,323 1,127    
30 to 59 Days past due | PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans $ 122 $ 86