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Investment Securities - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2024 USD ($) | Dec. 31, 2025 USD ($) security | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Financing Receivable, Impaired [Line Items] |  |  |  |
Debt securities, available-for-sale transferred to held-to-maturity | $ 2,720,000,000 |  |  |
Net unamortized unrealized holding losses on available for sale investment securities transferred to held to maturity | $ 537,400,000 | $ 0 | $ (537,434,000) | $ 0
Number of investment securities in a loss position for less than twelve months | security |  | 4 |  |
Number of investment securities in a loss position for twelve months or longer | security |  | 176 |  |
Allowance for credit loss |  | $ 0 |  |
Held-to-maturity, allowance for credit loss, measurement input |  | 0 |  |
Collateral Pledged |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
AFS pledged to secure deposits |  | 4,090,000,000.00 | 2,830,000,000 |
HTM pledged to secure deposits |  | $ 175,000 | $ 2,450,000,000 |

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