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Investment Securities - Pledged Securities and Concentration Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Concentration of risk |  |  |
Number of securities with intent to sell | 0 |  | 0
Credit losses recognized on securities | $ 0 | $ 0 | $ 0
Collateral Dependent Loans |  |  |
Financial Instruments Owned and Pledged as Collateral |  |  |
Investment securities pledged as collateral | 4,100,000,000 | 4,100,000,000 | 5,000,000,000.0
Collateral Dependent Loans | Public deposits |  |  |
Financial Instruments Owned and Pledged as Collateral |  |  |
Investment securities pledged as collateral | 2,000,000,000.0 | 2,000,000,000.0 | 2,600,000,000
Collateral Dependent Loans | Other financial transactions |  |  |
Financial Instruments Owned and Pledged as Collateral |  |  |
Investment securities pledged as collateral | 19,500,000 | 19,500,000 | 183,000,000.0
Borrowing Capacity |  |  |
Financial Instruments Owned and Pledged as Collateral |  |  |
Investment securities pledged as collateral | 2,100,000,000 | 2,100,000,000 | 2,300,000,000
Non-government issuer |  |  |
Concentration of risk |  |  |
Securities of issuers in excess of 10% of stockholders' equity | $ 0 | $ 0 | $ 0

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