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Regulatory Capital - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Jun. 30, 2023 | Jan. 01, 2023 | Jun. 30, 2022 | Jan. 01, 2022 | Dec. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  | $ 1,416,048 | $ 1,194,238 | $ 1,416,048 | $ 1,194,238 | $ 1,357,075 | $ 1,364,716 |  | $ 1,081,066 |  | $ 1,165,335
Liability for unfunded commitments |  | 113,847 | 107,794 | 113,847 | 107,794 | 124,924 | $ 62,600 |  | $ 113,525 |  | $ 72,713
Retained earnings |  | 3,485,575 |  | 3,485,575 |  | 3,163,640 |  |  |  |  |
Unrealized loss |  |  |  | 158,000 |  | 160,000 |  |  |  |  |
Unrealized loss, tax benefit |  |  |  | 51,000 |  | 52,000 |  |  |  |  |
Dividends |  | 100,000 | $ 241,000 | 400,000 | $ 642,000 |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Period of deferment | 2 years |  |  |  |  |  |  |  |  |  |
Percentage amount deferred per year | 25.00% |  |  |  |  |  |  |  |  |  |
Percentage amount phased in during year |  |  |  |  |  |  |  | 25.00% |  | 25.00% |
Allowance for credit losses | $ 1,100,000 | (259,536) |  | (259,536) |  | (259,536) |  |  |  |  |
Liability for unfunded commitments | 116,000 | (26,094) |  | (26,094) |  | (26,094) |  |  |  |  |
Deferred tax asset | 306,000 | (76,542) |  | (76,542) |  | (76,542) |  |  |  |  |
Retained earnings | $ 953,000 | $ (209,088) |  | $ (209,088) |  | $ (209,088) |  |  |  |  |

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