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Loans - Schedule Of Loans By Portfolio Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 27,350,214 | [1] |  | $ 27,658,929 | [1] | $ 20,166,091 |  |
Allowance for loan losses | 185,959 |  | $ 185,462 | 189,555 |  | 194,867 | $ 197,257 | $ 202,068
Total net loans | 27,164,255 |  |  | 27,469,374 |  |  |  |
Commercial, financial and industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 16,044,145 |  |  |  |  | 12,791,844 |  |
Allowance for loan losses | 100,314 |  | 96,834 | 98,211 |  | 98,205 | 92,379 | 89,398
Commercial real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 4,237,036 |  |  |  |  | 2,251,015 |  |
Allowance for loan losses | 33,915 |  | 33,832 | 28,427 |  | 29,683 | 30,470 | 33,852
Consumer real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 6,191,183 |  |  |  |  | 4,369,717 |  |
Allowance for loan losses | 26,537 |  | 31,769 | 37,371 |  | 40,939 | 46,069 | 50,357
Permanent mortgage |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 347,054 |  |  |  |  | 403,082 |  |
Allowance for loan losses | 13,480 |  | 14,078 | 15,565 |  | 15,719 | 16,398 | 16,289
Credit card & other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 530,796 |  |  |  |  | 350,433 |  |
Allowance for loan losses | 11,713 |  | $ 8,949 | 9,981 |  | $ 10,321 | $ 11,941 | $ 12,172
Commercial Portfolio Segment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 16,044,145 |  |  | 16,057,273 |  |  |  |
Allowance for loan losses | 134,229 |  |  | 126,638 |  |  |  |
Commercial Portfolio Segment | Commercial, financial and industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 16,044,145 |  |  | 16,057,273 |  |  |  |
Commercial Portfolio Segment | Commercial real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 4,237,036 |  |  | 4,214,695 |  |  |  |
Consumer Portfolio Segment | Consumer real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 6,191,183 |  |  | 6,367,755 |  |  |  |
Consumer Portfolio Segment | Permanent mortgage |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 347,054 |  |  | 399,307 |  |  |  |
Consumer Portfolio Segment | Credit card & other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 530,796 |  |  | 619,899 |  |  |  |
Consumer Portfolio Segment | Restricted real estate loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 17,100 |  |  | $ 24,200 |  |  |  |
[1] | September 30, 2018 and December 31, 2017 include $20.8 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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