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Loans - Schedule Of Loans By Portfolio Segment (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | $ 27,990,048 | [1] | $ 27,535,532 | [1] | $ 27,249,793 |
Allowance for loan losses | 184,911 |  | 180,424 |  | 187,194 | $ 189,555
Total net loans | 27,805,137 |  | 27,355,108 |  |  |
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | 138,095 |  | 130,258 |  |  |
Commercial | Commercial, financial, and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 17,176,112 |  | 16,514,328 |  | 15,828,308 |
Allowance for loan losses | 103,713 |  | 98,947 |  | 100,238 | 98,211
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 3,946,943 |  | 4,030,870 |  | 4,234,435 |
Allowance for loan losses | 34,382 |  | 31,311 |  | 29,057 | 28,427
Consumer | Consumer real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 6,151,503 |  | 6,249,516 |  | 6,355,519 |
Allowance for loan losses | 24,073 |  | 26,439 |  | 35,201 | 39,823
Consumer | Permanent mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 209,260 |  | 222,448 |  | 270,721 |
Allowance for loan losses | 10,081 |  | 11,000 |  | 12,984 | 13,113
Consumer | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 506,230 |  | 518,370 |  | 560,810 |
Allowance for loan losses | 12,662 |  | 12,727 |  | $ 9,714 | $ 9,981
Consumer | Restricted and secured consumer real estate loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | $ 15,000 |  | $ 16,200 |  |  |
[1] | March 31, 2019 and December 31, 2018 include $24.1 million and $28.6 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

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