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Segment Reporting - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments | segment |  | 4 |  |
Deposits transferred |  | $ (1,858,349) | $ 531,490 | $ (2,735,705)
Investment securities gains (losses), net |  | (76,718) | 0 | (799)
Non-interest expense |  | 1,335,424 | 1,157,506 | 1,099,904
Loans | $ 42,925,105 | 42,925,105 | 43,272,929 |
Increase in PPP fees |  |  | 12,600 | 79,200
Consumer | Third Party Consumer Loans |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Loss on sale of loans |  | 22,100 |  |
Loans | 421,700 | 421,700 |  |
Wholesale Banking | Commercial Real Estate | Medical Office Buildings Loans |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Loss on sale of loans |  | 28,000 |  |
Loans | 1,170,000 | 1,170,000 |  |
Treasury and Corporate Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Deposits transferred | 1,300,000 |  |  |
Investment securities gains (losses), net |  | (76,700) |  |
Non-interest expense | $ 51,000 | $ 657,375 | $ 545,338 | $ 534,018

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