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Regulatory Capital - Adjusted Transition Amounts (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2020
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |
Retained earnings | $ 3,884,694 | $ 3,624,859 |  |  |  |
Allowance for credit losses | 1,350,058 | 1,339,772 | $ 1,479,306 | $ 1,357,075 |  |
Liability for unfunded commitments | 32,034 | 112,962 | $ 32,720 | 124,924 |  |
Adjusted Phase-In Amounts Remaining |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |
Retained earnings | 209,087 |  |  |  | $ 836,351 |
Allowance for credit losses | 259,537 |  |  |  | 1,038,145 |
Liability for unfunded commitments | 26,094 |  |  |  | 104,377 |
Deferred tax asset | 76,544 |  |  |  | $ 306,171 |
Adjustments |  |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |
Retained earnings | (209,088) | (209,088) |  | (209,088) |  | $ 953,000
Allowance for credit losses | (259,536) | (259,536) |  | (259,536) |  | 1,100,000
Liability for unfunded commitments | (26,095) | (26,094) |  | (26,094) |  | 116,000
Deferred tax asset | $ (76,543) | $ (76,542) |  | $ (76,542) |  | $ 306,000

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