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Loans and Leases - Schedule Of Loans By Portfolio Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | $ 59,706,531 |  | $ 31,061,111 |  |  |
Allowance for loan and lease losses | (988,102) | $ (537,881) | (200,307) | $ (193,149) | $ (192,749) | $ (180,424)
Net loans and leases | 58,718,429 |  | 30,860,804 |  |  |
Equipment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Property, plant, and equipment and finance lease right-of-use asset | 524,200 |  |  |  |  |
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 33,655,717 |  | 20,051,091 |  |  |
Allowance for loan and lease losses |  |  | (158,598) |  |  |
Commercial | Commercial and industrial (a) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 28,048,649 |  | 15,640,208 |  |  |
Allowance for loan and lease losses | (489,094) | (318,722) | (122,486) | (114,130) | (116,096) | (98,947)
Commercial | Loans to mortgage companies |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 5,607,068 |  | 4,410,883 |  |  |
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 12,510,887 |  | 4,337,017 |  |  |
Allowance for loan and lease losses | (207,958) | (57,285) | (36,112) | (35,625) | (32,953) | (31,311)
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 12,327,869 |  | 6,177,139 |  |  |
Consumer | HELOC |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 2,549,837 |  | 1,287,441 |  |  |
Consumer | R/E installment loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 9,778,032 |  | 4,889,698 |  |  |
Consumer | Credit Card and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 1,212,058 |  | 495,864 |  |  |
Allowance for loan and lease losses | $ (25,620) | $ (18,117) | $ (13,266) | $ (12,720) | $ (12,168) | $ (12,727)

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