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Commitments and Contingencies (Other Commitments) (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Other Commitments [Line Items] |  |
Collateral Securities Repledged, Delivered, or Used | $ 744,500 |
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value | 1,000,000 |
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value of Securities Sold or Repledged | 502,500 |
Remaining collateral securities that can be sold, re-pledged or loaned | 539,900 |
Investment securities | 91,528 | $ 57,481
Options Clearing Corporation [Member] |  |
Other Commitments [Line Items] |  |
Investment securities | 15,000 | 8,500
National Securities Clearing Corporation [Member] |  |
Other Commitments [Line Items] |  |
Investment securities | $ 25,000 | $ 20,000

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