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Loans - Schedule Of Loans By Portfolio Segment (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | $ 33,378,303 | [1] | $ 31,061,111 | [1] | $ 27,990,048 |
Allowance for loan losses | 444,490 |  | 200,307 |  | 184,911 | $ 180,424
Total net loans | 32,933,813 |  | 30,860,804 |  |  |
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses |  |  | 158,598 |  |  |
Commercial | Commercial, financial, and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 22,124,430 |  | 20,051,091 |  | 17,176,112 |
Allowance for loan losses | 254,516 |  | 122,486 |  | 103,713 | 98,947
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 4,639,692 |  | 4,337,017 |  | 3,946,943 |
Allowance for loan losses | 47,625 |  | 36,112 |  | 34,382 | 31,311
Consumer | Consumer real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 6,119,383 |  | 6,177,139 |  | 6,360,763 |
Allowance for loan losses | 123,022 |  | 28,443 |  | 34,154 | 37,439
Consumer | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 494,798 |  | 495,864 |  | 506,230 |
Allowance for loan losses | $ 19,327 |  | $ 13,266 |  | $ 12,662 | $ 12,727
[1] | March 31, 2020 and December 31, 2019 include $20.8 million and $18.8 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

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