Securities - Trading Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Schedule of fair value of trading securities
Trading, at fair value	$ 698,106	$ 617,408
Investment-related Liabilities
Securities sold, not yet purchased, at fair value	63,346	37,955
U.S. Treasury securities
Schedule of fair value of trading securities
Trading, at fair value		123
Bonds
Schedule of fair value of trading securities
Trading, at fair value	42,055	37,222
Residential mortgage-backed securities
Schedule of fair value of trading securities
Trading, at fair value	76,355	152,343
Collateralized mortgage obligations
Schedule of fair value of trading securities
Trading, at fair value	144,065	58,611
Corporate debt securities
Schedule of fair value of trading securities
Trading, at fair value	70,904	41,136
States and political subdivisions
Schedule of fair value of trading securities
Trading, at fair value	332,750	295,615
Private-label securitized product
Schedule of fair value of trading securities
Trading, at fair value	6,304	9,547
Other Debt
Schedule of fair value of trading securities
Trading, at fair value	$ 25,673	$ 22,811