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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