Financial Assets and Liabilities - Netting of Certain Financial Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Securities borrowed
Gross Amounts of Recognized Assets	$ 1,918,973	$ 1,722,440
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	1,918,973	1,722,440
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(1,856,947)	(1,665,860)
Counterparty Netting/ Cash Collateral	(31,591)	(27,538)
Net Amount	30,435	29,042
Securities purchased under agreements to resell
Gross Amounts of Recognized Assets	793,292	1,512,114
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	793,292	1,512,114
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(792,919)	(1,512,114)
Counterparty Netting/ Cash Collateral
Net Amount	373	0
Total
Gross Amounts of Recognized Assets	2,997,910	3,615,318
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(275,473)	(354,698)
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	2,722,437	3,260,620
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(2,649,866)	(3,177,974)
Counterparty Netting/ Cash Collateral	(34,110)	(30,452)
Net Amount	38,461	52,194
Interest rate swap
Trading assets, at fair value:
Gross Amounts of Recognized Assets	5,612
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	5,612
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	0
Counterparty Netting/ Cash Collateral	0
Net Amount	5,612
Currency forwards
Trading assets, at fair value:
Gross Amounts of Recognized Assets	277,367	377,279
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(275,473)	(354,698)
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	1,894	22,581
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	0	0
Counterparty Netting/ Cash Collateral	0	0
Net Amount	1,894	22,581
Options
Trading assets, at fair value:
Gross Amounts of Recognized Assets	2,666	3,485
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	2,666	3,485
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	0	0
Counterparty Netting/ Cash Collateral	(2,519)	(2,914)
Net Amount	$ 147	$ 571