Securities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Securities
Net gains from principal transactions	$ 33,971	$ 29,708
Realized net gains from trading securities portfolio	34,000	29,700
Realized net gains (losses) from other securities	$ 0	$ 0
Financial Instrument, Owned, Pledged Status [Extensible Enumeration]	Asset Pledged as Collateral		Asset Pledged as Collateral
Asset Pledged as Collateral
Securities
Carrying amount of securities pledged	$ 900,000		$ 1,100,000
Fair value of securities pledged	$ 900,000		$ 1,000,000