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Current Accounting Developments and Summary of Significant Accounting Policies (Details) $ in Thousands | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2020 | Sep. 30, 2020 USD ($) loan | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for loan losses |  | $ 618,252 |  | $ 358,287
Retained earnings |  | $ 3,875,715 |  | $ 3,689,377
Commercial and industrial (“C&I”) | CARES Act, Paycheck Protection Program Liquidity Facility |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Interest rate | 1.00% |  |  |
Number of loans funded | loan |  | 7,400 |  |
Outstanding loan balance |  | $ 1,770,000 |  |
ASU 2016-13 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for loan losses |  |  | $ 125,200 |
Retained earnings |  |  | 98,000 |
ASU 2016-13 | Unfunded Credit Commitments |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for loan losses |  |  | $ 10,500 |

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