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Loans and Leases (Composition of the Loans and Leases Outstanding By Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans $ 20,928,709 $ 19,289,474  
PCI Loans 809,169 950,516 $ 1,186,498
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 13,760,703 12,630,489  
PCI Loans 499,970 593,614  
Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 649,157 620,352  
PCI Loans 20,766 33,880  
Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 9,026,220 8,274,548  
PCI Loans 453,013 525,468  
Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 351,291 321,021  
PCI Loans 12,645 17,076  
Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,567,501 2,368,958  
PCI Loans 11,844 15,182  
Commercial | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 826,270 730,778  
Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 340,264 314,832  
PCI Loans 1,702 2,008  
Commercial | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 1,702 2,008  
Commercial | Pass      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 13,370,678 12,204,677  
PCI Loans 258,819 294,663  
Commercial | Pass | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 645,232 611,314  
PCI Loans 8,103 14,710  
Commercial | Pass | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 8,821,439 8,024,831  
PCI Loans 234,023 262,579  
Commercial | Pass | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 347,509 318,187  
PCI Loans 8,744 7,366  
Commercial | Pass | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,402,659 2,219,606  
PCI Loans 7,253 9,302  
Commercial | Pass | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 818,008 719,338  
Commercial | Pass | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 335,831 311,401  
Commercial | Pass | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 696 706  
Commercial | Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 106,252 132,021  
PCI Loans 69,520 89,625  
Commercial | Special Mention | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,236 5,191  
PCI Loans 950 758  
Commercial | Special Mention | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 76,084 100,220  
PCI Loans 67,848 87,870  
Commercial | Special Mention | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 1,433 475  
PCI Loans 102 60  
Commercial | Special Mention | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 22,804 19,361  
PCI Loans 620 937  
Commercial | Special Mention | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,675 4,869  
Commercial | Special Mention | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 1,020 1,905  
Commercial | Special Mention | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 0 0  
Commercial | Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 157,593 180,100  
PCI Loans 154,278 193,051  
Commercial | Substandard | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 1,683 3,847  
PCI Loans 7,850 14,131  
Commercial | Substandard | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 126,863 146,071  
PCI Loans 138,312 163,801  
Commercial | Substandard | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,349 959  
PCI Loans 3,462 9,229  
Commercial | Substandard | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 17,870 21,322  
PCI Loans 3,648 4,588  
Commercial | Substandard | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 5,415 6,375  
Commercial | Substandard | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 3,413 1,526  
Commercial | Substandard | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 1,006 1,302  
Commercial | Doubtful      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 348 1,176  
PCI Loans 17,333 15,438  
Commercial | Doubtful | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 6 0  
PCI Loans 3,863 4,281  
Commercial | Doubtful | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 334 599  
PCI Loans 12,830 10,875  
Commercial | Doubtful | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 0  
PCI Loans 337 0  
Commercial | Doubtful | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 8 408  
PCI Loans 303 282  
Commercial | Doubtful | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 169  
Commercial | Doubtful | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 0  
Commercial | Doubtful | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 0 0  
Commercial | Ungraded      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 125,832 112,515  
PCI Loans 20 837  
Commercial | Ungraded | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 0  
PCI Loans 0 0  
Commercial | Ungraded | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 1,500 2,827  
PCI Loans 0 343  
Commercial | Ungraded | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 1,400  
PCI Loans 0 421  
Commercial | Ungraded | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 124,160 108,261  
PCI Loans 20 73  
Commercial | Ungraded | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 172 27  
Commercial | Ungraded | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 0 0  
Commercial | Ungraded | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 0 0  
Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 7,168,006 6,658,985  
PCI Loans 309,199 356,902  
Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 231,400 220,073  
Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,889,124 2,695,985  
Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,601,344 2,523,106  
Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 1,446,138 1,219,821  
PCI Loans 1,772 2,273  
Non-PCI Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 20,928,709 19,289,474  
Current 20,799,457 19,167,898  
Past Due 129,252 121,576  
Non-PCI Loans | Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 649,157 620,352  
Current 646,987 618,619  
Past Due 2,170 1,733  
Non-PCI Loans | Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 9,026,220 8,274,548  
Current 9,001,526 8,243,584  
Past Due 24,694 30,964  
Non-PCI Loans | Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 351,291 321,021  
Current 350,981 319,995  
Past Due 310 1,026  
Non-PCI Loans | Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,567,501 2,368,958  
Current 2,556,430 2,363,966  
Past Due 11,071 4,992  
Non-PCI Loans | Commercial | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 826,270 730,778  
Current 823,788 728,542  
Past Due 2,482 2,236  
Non-PCI Loans | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 340,264 314,832  
Current 339,994 314,531  
Past Due 270 301  
Non-PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 7,168,006 6,658,985  
Current 7,079,751 6,578,661  
Non-PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 231,400 220,073  
Current 229,106 214,555  
Past Due 2,294 5,518  
Non-PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,889,124 2,695,985  
Current 2,839,045 2,651,209  
Past Due 50,079 44,776  
Non-PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 2,601,344 2,523,106  
Current 2,576,942 2,502,065  
Past Due 24,402 21,041  
Non-PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Non-PCI Loans 1,446,138 1,219,821  
Current 1,434,658 1,210,832  
Past Due 11,480 8,989  
PCI Loans | Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 20,766 33,880  
PCI Loans | Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 453,013 525,468  
PCI Loans | Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 12,645 17,076  
PCI Loans | Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 11,844 15,182  
PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 265,529 307,089  
PCI Loans 309,199 356,902  
PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 0 0  
PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 230,065 257,207  
PCI Loans 268,777 302,158  
PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 33,827 47,901  
PCI Loans 38,650 52,471  
PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 1,637 1,981  
PCI Loans 1,772 2,273  
PCI Loans | Noncommercial | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
PCI Loans 3,474 4,281  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 72,876 63,522  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,845 987  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 11,592 13,023  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 310 884  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 7,918 2,133  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,175 2,070  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 72 3  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 49,964 44,422  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,139 3,211  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 27,760 23,960  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 14,290 11,706  
Financing Receivables, 30 to 59 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 6,775 5,545  
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 10,281 13,531  
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 9,595 12,318  
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 618 1,127  
Financing Receivables, 30 to 59 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 68 86  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 18,472 18,705  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 39 283  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,773 3,446  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,102 1,079  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 444 2  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 164  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 13,114 13,731  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 598 669  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 7,039 7,536  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,698 3,704  
Financing Receivables, 60 to 89 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 2,779 1,822  
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 6,800 5,074  
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 6,528 4,441  
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 268 501  
Financing Receivables, 60 to 89 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 4 132  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 37,904 39,349  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 286 463  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 10,329 14,495  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 0 142  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,051 1,780  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Lease financing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 863 164  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Commercial | Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 198 134  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 25,177 22,171  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Construction and land development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 557 1,638  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 15,280 13,280  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 7,414 5,631  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Non-PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 1,926 1,622  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 26,589 31,208  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 22,589 28,192  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Revolving mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due 3,937 2,942  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | PCI Loans | Noncommercial | Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past Due $ 63 $ 74