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v3.25.3

Securities (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) Security | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Security | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) Security
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Securities with an aggregate fair value | $ 4,007,692,000 |  | $ 4,007,692,000 |  | $ 4,608,320,000
Securities available for sale, amortized cost | 6,203,454,000 |  | 6,203,454,000 |  | 5,774,133,000
Securities classified as trading | 0 |  | 0 |  | $ 0
Gross gains | 0 | $ 0 | 0 | $ 0 |
Gross losses | 0 | $ 0 | 0 | $ 0 |
Allowance for credit loss | $ 0 |  | $ 0 |  |
Securities that met the criteria of a credit loss event | Security | 0 |  | 0 |  |
Number of securities with market values below their cost basis | Security | 611 |  | 611 |  | 729
Asset Pledged as Collateral without Right [Member] |  |  |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |  |  |
Securities pledged as collateral | $ 3,200,000,000 |  | $ 3,200,000,000 |  | $ 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 | $ 31,800,000 |  | $ 31,800,000 |  | $ 29,800,000

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