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Allowance for Loan Losses (Rollforward Of The Allowance For Loan Losses By Portfolio Segment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance $ 202,068 $ 210,242 $ 232,448
Charge-offs (46,394) (57,639) (75,856)
Recoveries 33,881 38,465 44,650
Provision/(provision credit) for loan losses 0 11,000 9,000
Ending Balance 189,555 202,068 210,242
Allowance - individually evaluated for impairment 41,767 45,818 51,032
Allowance - collectively evaluated for impairment 144,620 155,527 157,528
Allowance - purchased credit-impaired loans 3,168 723 1,682
Individually evaluated for impairment 259,713 298,778 308,049
Collectively evaluated for impairment 27,219,667 19,243,664 17,337,055
Purchased credit-impaired loans 179,549 47,078 41,398
Total loans, net of unearned income 27,658,929 [1] 19,589,520 [1] 17,686,502
C&I      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 89,398 73,637 67,011
Charge-offs (17,657) (18,460) (22,406)
Recoveries 4,568 6,795 13,339
Provision/(provision credit) for loan losses 21,902 27,426 15,693
Ending Balance 98,211 89,398 73,637
Allowance - individually evaluated for impairment 6,044 4,219 3,643
Allowance - collectively evaluated for impairment 89,358 85,015 69,980
Allowance - purchased credit-impaired loans 2,809 164 14
Individually evaluated for impairment 43,024 47,962 30,472
Collectively evaluated for impairment 15,909,110 12,059,593 10,389,841
Purchased credit-impaired loans 105,139 40,532 16,077
Total loans, net of unearned income 16,057,273 12,148,087 10,436,390
Commercial Real Estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 33,852 25,159 18,574
Charge-offs (195) (1,371) (3,550)
Recoveries 966 1,927 1,876
Provision/(provision credit) for loan losses (6,196) 8,137 8,259
Ending Balance 28,427 33,852 25,159
Allowance - individually evaluated for impairment 132 194 481
Allowance - collectively evaluated for impairment 28,291 33,503 23,519
Allowance - purchased credit-impaired loans 4 155 1,159
Individually evaluated for impairment 2,407 3,124 9,055
Collectively evaluated for impairment 4,181,908 2,127,481 1,644,792
Purchased credit-impaired loans 30,380 4,918 21,088
Total loans, net of unearned income 4,214,695 2,135,523 1,674,935
Consumer Real Estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 50,357 80,614 113,011
Charge-offs (13,156) (21,993) (30,068)
Recoveries 22,723 23,719 23,895
Provision/(provision credit) for loan losses (22,553) (31,983) (26,224)
Ending Balance 37,371 50,357 80,614
Allowance - individually evaluated for impairment 23,175 28,802 31,278
Allowance - collectively evaluated for impairment 13,841 21,151 48,828
Allowance - purchased credit-impaired loans 355 404 508
Individually evaluated for impairment 128,895 153,460 165,684
Collectively evaluated for impairment 6,200,330 4,368,716 4,596,654
Purchased credit-impaired loans 38,530 1,576 4,180
Total loans, net of unearned income 6,367,755 4,523,752 4,766,518
Permanent Mortgage      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 16,289 18,947 19,122
Charge-offs (2,179) (1,591) (3,141)
Recoveries 2,509 2,403 1,687
Provision/(provision credit) for loan losses (1,054) (3,470) 1,279
Ending Balance 15,565 16,289 18,947
Allowance - individually evaluated for impairment 12,105 12,470 15,463
Allowance - collectively evaluated for impairment 3,460 3,819 3,484
Allowance - purchased credit-impaired loans 0 0 0
Individually evaluated for impairment 84,794 93,926 102,461
Collectively evaluated for impairment 314,513 329,199 351,662
Purchased credit-impaired loans 0 0 0
Total loans, net of unearned income 399,307 423,125 454,123
Credit Card and Other      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 12,172 11,885 14,730
Charge-offs (13,207) (14,224) (16,691)
Recoveries 3,115 3,621 3,853
Provision/(provision credit) for loan losses 7,901 10,890 9,993
Ending Balance 9,981 12,172 11,885
Allowance - individually evaluated for impairment 311 133 167
Allowance - collectively evaluated for impairment 9,670 12,039 11,717
Allowance - purchased credit-impaired loans 0 0 1
Individually evaluated for impairment 593 306 377
Collectively evaluated for impairment 613,806 358,675 354,106
Purchased credit-impaired loans 5,500 52 53
Total loans, net of unearned income $ 619,899 $ 359,033 $ 354,536
[1] December 31, 2017 and 2016 include $22.7 million and $28.5 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.