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Investment Securities - Investments, Debt and Equity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Marketable Securities [Line Items] |  |
Investments in equity securities | $ 128,822 | $ 76,156
Investments in equity securities accounted for under the equity method | 10,808 | 9,259
Consolidated Entity, Excluding VIE |  |
Marketable Securities [Line Items] |  |
Total investment securities | $ 139,630 | $ 85,415

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