Investment Securities and Certificates of Deposit - Estimated Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	$ 877,803	$ 813,804
Total Investment Securities, at fair value	1,540,217	1,452,721
Certificates of Deposit, at contract value	40,421	66,660
Total Investment Securities and Certificates of Deposit	1,580,638	1,519,381
Debt Securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale	877,803	813,804
Equity Securities
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI	355	298
Debt Securities Carried by EGL
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Trading	486,641	459,916
Investment Funds
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI	$ 175,418	$ 178,703

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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