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Regulatory Capital - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Allowance for credit losses |  | $ 1,350,058 | $ 1,479,306 | $ 1,339,772 | $ 1,357,075
Liability for unfunded commitments |  | 32,034 | 32,720 | 112,962 | 124,924
Retained earnings |  | 3,884,694 |  | 3,624,859 |
Unrealized gain (loss) |  | (115,000) |  | (115,000) |
Unrealized gain (loss), tax benefit |  | (37,000) |  | (37,000) |
Dividends |  | 160,000 | $ 0 |  |
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% |  |  |  |
Allowance for credit losses | $ 1,100,000 | (259,536) |  | (259,536) | (259,536)
Liability for unfunded commitments | 116,000 | (26,095) |  | (26,094) | (26,094)
Deferred tax asset | 306,000 | (76,543) |  | (76,542) | (76,542)
Retained earnings | $ 953,000 | $ (209,088) |  | $ (209,088) | $ (209,088)

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