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v3.26.1

Securities (Narrative) (Details) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jan. 31, 2026 USD ($) | Mar. 31, 2026 USD ($) Security | Mar. 31, 2025 USD ($) | Dec. 31, 2025 USD ($) Security
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Securities with an aggregate fair value |  | $ 4,468,133,000 |  | $ 4,226,864,000
Securities available for sale, amortized cost |  | 6,287,446,000 |  | 6,341,322,000
Securities classified as trading |  | 0 |  | $ 0
Restructuring costs | $ 1,500,000,000 |  |  |
Net realized loss | $ (50,400,000) | (98,595,000) | $ 0 |
Allowance for credit loss |  | $ 0 |  |
Securities that met the criteria of a credit loss event | Security |  | 0 |  |
Number of securities with market values below their cost basis | Security |  | 592 |  | 604
Asset Pledged as Collateral without Right [Member] |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Securities pledged as collateral |  | $ 3,500,000,000 |  | $ 3,900,000,000
Available for Sale and Held to Maturity [Member] |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |
Amortized cost of securities excluding accrued interest |  | $ 33,600,000 |  | $ 31,700,000

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