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Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance $ 189,555 $ 202,068 $ 210,242
Charge-offs (45,797) (46,394) (57,639)
Recoveries 29,666 33,881 38,465
Provision/(provision credit) for loan losses 7,000 0 11,000
Ending Balance 180,424 189,555 202,068
Allowance - individually evaluated for impairment 28,814 41,767 45,818
Allowance - collectively evaluated for impairment 147,573 144,620 155,527
Allowance - purchased credit-impaired loans 4,037 3,168 723
Individually evaluated for impairment 240,533 259,713 298,778
Collectively evaluated for impairment 27,204,542 27,219,667 19,243,664
Purchased credit-impaired loans 90,457 179,549 47,078
Total loans, net of unearned income 27,535,532 [1] 27,658,929 [1] 19,589,520
Commercial      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 126,638    
Ending Balance 130,258 126,638  
Allowance - individually evaluated for impairment 1,074 6,176  
Allowance - collectively evaluated for impairment 126,361 117,649  
Allowance - purchased credit-impaired loans 2,823 2,813  
Individually evaluated for impairment 50,558 45,431  
Collectively evaluated for impairment 20,437,747 20,091,018  
Purchased credit-impaired loans 56,893 135,519  
Commercial | C&I      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 98,211 89,398 73,637
Charge-offs (15,492) (17,657) (18,460)
Recoveries 4,201 4,568 6,795
Provision/(provision credit) for loan losses 12,027 21,902 27,426
Ending Balance 98,947 98,211 89,398
Allowance - individually evaluated for impairment 1,074 6,044 4,219
Allowance - collectively evaluated for impairment 95,050 89,358 85,015
Allowance - purchased credit-impaired loans 2,823 2,809 164
Individually evaluated for impairment 48,592 43,024 47,962
Collectively evaluated for impairment 16,424,006 15,909,110 12,059,593
Purchased credit-impaired loans 41,730 105,139 40,532
Total loans, net of unearned income 16,514,328 16,057,273 12,148,087
Commercial | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 28,427 33,852 25,159
Charge-offs (783) (195) (1,371)
Recoveries 339 966 1,927
Provision/(provision credit) for loan losses 3,328 (6,196) 8,137
Ending Balance 31,311 28,427 33,852
Allowance - individually evaluated for impairment 0 132 194
Allowance - collectively evaluated for impairment 31,311 28,291 33,503
Allowance - purchased credit-impaired loans 0 4 155
Individually evaluated for impairment 1,966 2,407 3,124
Collectively evaluated for impairment 4,013,741 4,181,908 2,127,481
Purchased credit-impaired loans 15,163 30,380 4,918
Total loans, net of unearned income 4,030,870 4,214,695 2,135,523
Consumer | Consumer Real Estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 39,823 51,424 80,662
Charge-offs (9,357) (13,156) (21,993)
Recoveries 19,666 22,723 23,719
Provision/(provision credit) for loan losses (23,693) (21,168) (30,964)
Ending Balance 26,439 39,823 51,424
Allowance - individually evaluated for impairment 17,984 23,175 28,802
Allowance - collectively evaluated for impairment 7,368 16,293 22,218
Allowance - purchased credit-impaired loans 1,087 355 404
Individually evaluated for impairment 118,434 128,895 153,460
Collectively evaluated for impairment 6,099,272 6,311,817 4,439,143
Purchased credit-impaired loans 31,810 38,530 1,576
Total loans, net of unearned income 6,249,516 6,479,242 4,594,179
Consumer | Permanent Mortgage      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 13,113 15,222 18,899
Charge-offs (477) (2,179) (1,591)
Recoveries 1,421 2,509 2,403
Provision/(provision credit) for loan losses (3,057) (2,439) (4,489)
Ending Balance 11,000 13,113 15,222
Allowance - individually evaluated for impairment 9,419 12,105 12,470
Allowance - collectively evaluated for impairment 1,581 1,008 2,752
Allowance - purchased credit-impaired loans 0 0 0
Individually evaluated for impairment 70,846 84,794 93,926
Collectively evaluated for impairment 151,602 203,026 258,772
Purchased credit-impaired loans 0 0 0
Total loans, net of unearned income 222,448 287,820 352,698
Consumer | Credit card & other      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning Balance 9,981 12,172 11,885
Charge-offs (19,688) (13,207) (14,224)
Recoveries 4,039 3,115 3,621
Provision/(provision credit) for loan losses 18,395 7,901 10,890
Ending Balance 12,727 9,981 12,172
Allowance - individually evaluated for impairment 337 311 133
Allowance - collectively evaluated for impairment 12,263 9,670 12,039
Allowance - purchased credit-impaired loans 127 0 0
Individually evaluated for impairment 695 593 306
Collectively evaluated for impairment 515,921 613,806 358,675
Purchased credit-impaired loans 1,754 5,500 52
Total loans, net of unearned income $ 518,370 $ 619,899 $ 359,033
[1] December 31, 2018 and 2017 include $28.6 million and $22.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.