Financial Assets and Liabilities - Netting of Certain Financial Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Securities borrowed
Gross Amounts of Recognized Assets	$ 3,098,666	$ 2,294,529
Amounts Offset in the Condensed Consolidated Statements of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	3,098,666	2,294,529
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(3,005,737)	(2,222,054)
Counterparty Netting/ Cash Collateral	(40,987)	(39,309)
Net Amount	51,942	33,166
Securities purchased under agreements to resell
Gross Amounts of Recognized Assets	1,266,106	983,941
Amounts Offset in the Condensed Consolidated Statements of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	1,266,106	983,941
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(1,265,955)	(983,753)
Counterparty Netting/ Cash Collateral	0	0
Net Amount	151	188
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Net Amount	51,942	33,166
Total
Gross Amounts of Recognized Assets	4,556,179	4,050,863
Amounts Offset in the Condensed Consolidated Statements of Financial Condition	(176,877)	(676,905)
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	4,379,302	3,373,958
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(4,271,692)	(3,205,807)
Counterparty Netting/ Cash Collateral	(50,703)	(94,732)
Net Amount	56,907	73,419
Currency forwards
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Net Amount	4,308	40,065
Trading assets, at fair value:
Gross Amounts of Recognized Assets	181,185	716,970
Amounts Offset in the Condensed Consolidated Statements of Financial Condition	(176,877)	(676,905)
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	4,308	40,065
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	0	0
Counterparty Netting/ Cash Collateral	0	0
Net Amount	4,308	40,065
Options
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Net Amount	506	0
Trading assets, at fair value:
Gross Amounts of Recognized Assets	10,222	55,423
Amounts Offset in the Condensed Consolidated Statements of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	10,222	55,423
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	0	0
Counterparty Netting/ Cash Collateral	(9,716)	(55,423)
Net Amount	$ 506	$ 0

Fair value, after effect of master netting arrangement and deduction of obligation to return financial collateral not offset and financial instrument subject to master netting arrangement not offset, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset. Excludes derivative not subject to master netting arrangement or similar agreement.

Name:	us-gaap_DerivativeAssetFairValueAfterOffsetAndDeductionSubjectToMasterNettingArrangement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.