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Regulatory Capital - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans and leases | $ 441,912,000 | $ 1,734,559,000 | $ 414,406,000 | $ 1,734,559,000 | $ 414,406,000 | $ 1,929,323,000 | $ 441,912,000 | $ 383,997,000 | $ 341,121,000
Allowance for credit losses on unfunded commitments | $ 2,481,000 |  |  |  |  |  |  |  |
Dividends |  | $ 0 | $ 20,000,000 | $ 568,000,000 | $ 241,000,000 |  |  |  |
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 |  |  |  |  |  |  |  |
Allowance for credit losses on unfunded commitments | 116,000,000 |  |  |  |  |  |  |  |
Deferred tax assets | 306,000,000 |  |  |  |  |  |  |  |
Reduction to retained earnings | $ 953,000,000 |  |  |  |  |  |  |  |

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