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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans $ 945,887 $ 950,516 $ 1,252,545 $ 1,186,498
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 12,789,915 12,630,489    
PCI loans 594,227 593,614    
Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 8,353,631 8,274,548    
PCI loans 526,776 525,468    
Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 324,858 321,021    
PCI loans 18,050 17,076    
Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,389,946 2,368,958    
PCI loans 14,742 15,182    
Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 751,292 730,778    
Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 343,877 314,832    
PCI loans 1,860 2,008    
Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 626,311 620,352    
PCI loans 32,799 33,880    
Commercial | Pass        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 12,374,106 12,204,677    
PCI loans 292,419 294,663    
Commercial | Pass | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 8,102,908 8,024,831    
PCI loans 261,904 262,579    
Commercial | Pass | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 321,375 318,187    
PCI loans 8,500 7,366    
Commercial | Pass | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,241,626 2,219,606    
PCI loans 8,595 9,302    
Commercial | Pass | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 744,585 719,338    
Commercial | Pass | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 341,300 311,401    
PCI loans 623 706    
Commercial | Pass | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 622,312 611,314    
PCI loans 12,797 14,710    
Commercial | Special Mention        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 119,680 132,021    
PCI loans 90,189 89,625    
Commercial | Special Mention | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 97,425 100,220    
PCI loans 87,801 87,870    
Commercial | Special Mention | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,294 475    
PCI loans 59 60    
Commercial | Special Mention | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 14,003 19,361    
PCI loans 548 937    
Commercial | Special Mention | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,698 4,869    
Commercial | Special Mention | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,334 1,905    
PCI loans 0 0    
Commercial | Special Mention | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,926 5,191    
PCI loans 1,781 758    
Commercial | Substandard        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 176,706 180,100    
PCI loans 187,749 193,051    
Commercial | Substandard | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 149,651 146,071    
PCI loans 159,083 163,801    
Commercial | Substandard | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,030 959    
PCI loans 9,081 9,229    
Commercial | Substandard | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 20,070 21,322    
PCI loans 4,292 4,588    
Commercial | Substandard | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,639 6,375    
Commercial | Substandard | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,243 1,526    
PCI loans 1,237 1,302    
Commercial | Substandard | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,073 3,847    
PCI loans 14,056 14,131    
Commercial | Doubtful        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 903 1,176    
PCI loans 23,061 15,438    
Commercial | Doubtful | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 458 599    
PCI loans 17,656 10,875    
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 399 408    
PCI loans 1,240 282    
Commercial | Doubtful | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 46 169    
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 4,165 4,281    
Commercial | Ungraded        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 118,520 112,515    
PCI loans 809 837    
Commercial | Ungraded | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 3,189 2,827    
PCI loans 332 343    
Commercial | Ungraded | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,159 1,400    
PCI loans 410 421    
Commercial | Ungraded | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 113,848 108,261    
PCI loans 67 73    
Commercial | Ungraded | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 324 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 351,660 356,902    
Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 298,662 302,158    
Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 50,574 52,471    
Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 2,424 2,273    
Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 19,471,802 19,289,474    
Past due loans 126,873 121,576    
Current loans 19,344,929 19,167,898    
Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 8,353,631 8,274,548    
Past due loans 33,697 30,964    
Current loans 8,319,934 8,243,584    
Non-PCI Loans | Commercial | Other commercial real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 324,858 321,021    
Past due loans 1,419 1,026    
Current loans 323,439 319,995    
Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,389,946 2,368,958    
Past due loans 11,117 4,992    
Current loans 2,378,829 2,363,966    
Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 751,292 730,778    
Past due loans 958 2,236    
Current loans 750,334 728,542    
Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 343,877 314,832    
Past due loans 440 301    
Current loans 343,437 314,531    
Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 626,311 620,352    
Past due loans 1,360 1,733    
Current loans 624,951 618,619    
Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 6,681,887 6,658,985    
Current loans 6,604,005 6,578,661    
Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,718,208 2,695,985    
Past due loans 44,757 44,776    
Current loans 2,673,451 2,651,209    
Non-PCI Loans | Noncommercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 213,232 220,073    
Past due loans 4,288 5,518    
Current loans 208,944 214,555    
Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 2,521,902 2,523,106    
Past due loans 20,383 21,041    
Current loans 2,501,519 2,502,065    
Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Non-PCI loans 1,228,545 1,219,821    
Past due loans 8,454 8,989    
Current loans 1,220,091 1,210,832    
PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
PCI loans 945,887 950,516    
PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 307,885 307,089    
PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 261,230 257,207    
PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 44,401 47,901    
PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Current loans 2,254 1,981    
90 Days or greater | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 41,565 39,349    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 17,637 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 1,194 1,780    
90 Days or greater | Non-PCI Loans | Commercial | Lease financing        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 44 164    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 333 134    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 312 463    
90 Days or greater | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 22,018 22,171    
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 13,015 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 842 1,638    
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 6,768 5,631    
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,393 1,622    
90 Days or greater | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 27,259 31,208    
90 Days or greater | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 23,934 28,192    
90 Days or greater | PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,323 2,942    
90 Days or greater | PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2 74    
60 to 89 Days past due | Non-PCI Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 15,809 18,705    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,817 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 248 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 2,049 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 202 2    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 0 164    
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 9 283    
60 to 89 Days past due | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 11,484 13,731    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 7,041 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 325 669    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 2,396 3,704    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,722 1,822    
60 to 89 Days past due | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 4,542 5,074    
60 to 89 Days past due | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 3,191 4,441    
60 to 89 Days past due | PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,306 501    
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 69,499 63,522    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 14,243 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 1,144 884    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 7,874 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 712 2,070    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 107 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 1,039 987    
30 to 59 Days past due | Non-PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 44,380 44,422    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 24,701 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 3,121 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 11,219 11,706    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 5,339 5,545    
30 to 59 Days past due | PCI Loans | Noncommercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 11,974 13,531    
30 to 59 Days past due | PCI Loans | Noncommercial | Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 10,307 12,318    
30 to 59 Days past due | PCI Loans | Noncommercial | Revolving mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans 1,544 1,127    
30 to 59 Days past due | PCI Loans | Noncommercial | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Past due loans $ 123 $ 86