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Investment Securities - Pledged Securities and Concentration Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Collateral Dependent Loans |  |
Financial Instruments Owned and Pledged as Collateral |  |
Investment securities pledged as collateral | $ 3,800,000 | $ 5,000,000
Collateral Dependent Loans | Borrowing Capacity |  |
Financial Instruments Owned and Pledged as Collateral |  |
Investment securities pledged as collateral | 2,100,000 | 2,300,000
Collateral Dependent Loans | Public deposits |  |
Financial Instruments Owned and Pledged as Collateral |  |
Investment securities pledged as collateral | 1,700,000 | 2,600,000
Collateral Dependent Loans | Other financial transactions |  |
Financial Instruments Owned and Pledged as Collateral |  |
Investment securities pledged as collateral | 19,300 | 183,000
Non-government issuer |  |
Concentration of risk |  |
Securities of issuers in excess of 10% of stockholders' equity | $ 0 | $ 0

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