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Loans and Leases - Concentrations and Restrictions (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | $ 59,706,531 | $ 31,061,111
Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | 33,655,717 | 20,051,091
Commercial | Commercial, Financial, and Industrial (a) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | $ 28,048,649 | 15,640,208
Commercial | Commercial, Financial, and Industrial (a) | Finance And Insurance Companies |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage contributed in total loan | 5.00% |
Loans, net of unearned income | $ 3,100,000 |
Percentage of commercial & industrial loan portfolio | 9.00% |
Commercial | Commercial, Financial, and Industrial (a) | Loans to mortgage companies |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage contributed in total loan | 9.00% |
Loans, net of unearned income | $ 5,607,068 | 4,410,883
Percentage of commercial & industrial loan portfolio | 17.00% |
Percentage Contributed | 26.00% |
Commercial | Loans to mortgage companies |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income | $ 5,607,068 | $ 4,410,883
Residential Portfolio Segment [Member] | Real Estate Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percentage contributed in total loan | 21.00% |

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