Securities - Trading Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Schedule of fair value of trading securities
Trading, at fair value	$ 596,565	$ 617,408
Investment-related Liabilities
Securities sold, not yet purchased, at fair value	105,571	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	17,583	37,222
Residential mortgage-backed securities
Schedule of fair value of trading securities
Trading, at fair value	45,021	152,343
Collateralized mortgage obligations
Schedule of fair value of trading securities
Trading, at fair value	14,572	58,611
Other
Schedule of fair value of trading securities
Trading, at fair value	16,842
Corporate debt securities
Schedule of fair value of trading securities
Trading, at fair value	47,598	41,136
States and political subdivisions
Schedule of fair value of trading securities
Trading, at fair value	309,206	295,615
Private-label securitized product
Schedule of fair value of trading securities
Trading, at fair value	14,013	9,547
Commercial paper
Schedule of fair value of trading securities
Trading, at fair value	100,289
Other Debt
Schedule of fair value of trading securities
Trading, at fair value	$ 31,441	$ 22,811