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Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Unrealized gain (loss) on investment securities held at the end of the period $ 9,109 $ 10,697 $ 28,184 $ 20,198