Regulatory Capital - Adjusted Transition Amounts (Details) - USD ($) $ in Thousands |
Sep. 30, 2024 |
Jun. 30, 2024 |
Dec. 31, 2023 |
Sep. 30, 2023 |
Jun. 30, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Jan. 01, 2020 |
|---|---|---|---|---|---|---|---|---|
| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] | ||||||||
| Retained earnings | $ 4,034,640 | $ 3,624,859 | ||||||
| Allowance for credit losses | 1,413,621 | $ 1,269,652 | 1,339,772 | $ 1,416,048 | $ 1,364,716 | $ 1,357,075 | ||
| Liability for unfunded commitments | 91,959 | $ 49,479 | 112,962 | $ 113,847 | $ 62,600 | 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 |