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Regulatory Capital - Additional Information (Details) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Allowance for credit losses on loans and leases |  | $ 1,179,021,000 | $ 1,673,324,000 | $ 1,361,723,000 | $ 441,912,000
Ending balance |  | 19,367,000 | 29,707,000 | $ 110,044,000 | $ 2,481,000
Dividends |  | $ 1,000,000,000.0 | $ 541,000,000 |  |
Accounting Standards Update 2016-13 |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Period of deferment | 2 |  |  |  |
Amount deferred | 25.00% |  |  |  |
Allowance for credit losses on loans and leases | $ 1,100,000,000 |  |  |  |
Ending balance | 116,000,000 |  |  |  |
Deferred tax assets | 306,000,000 |  |  |  |
Reduction to retained earnings | $ 953,000,000 |  |  |  |

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