Investment Securities and Certificates of Deposit - Estimated Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	$ 185,414	$ 744,315
Investment Securities	817,301	1,382,027
Certificates of Deposit, at Carrying Value	48,001	54,856
Investment Securities and Certificates of Deposit	865,302	1,436,883
Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	185,414	744,315
Equity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI	297	375
Debt Securities Carried By EGL [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading	467,486	476,778
Investment Funds [Member]
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI	$ 164,104	$ 160,559

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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