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Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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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.

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- Definition The recorded balance for loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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