Financial Assets and Liabilities - Netting of Certain Financial Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities borrowed
Gross Amounts of Recognized Assets	$ 1,782,982	$ 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	1,782,982	1,722,440
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(1,739,045)	(1,665,860)
Counterparty Netting/ Cash Collateral	(22,685)	(27,538)
Net Amount	21,252	29,042
Securities purchased under agreements to resell
Gross Amounts of Recognized Assets	502,470	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	502,470	1,512,114
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(502,470)	(1,512,114)
Counterparty Netting/ Cash Collateral
Net Amount	0	0
Total
Gross Amounts of Recognized Assets	2,584,752	3,615,318
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(268,583)	(354,698)
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	2,316,169	3,260,620
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	(2,241,515)	(3,177,974)
Counterparty Netting/ Cash Collateral	(24,789)	(30,452)
Net Amount	49,865	52,194
Currency forwards
Trading assets, at fair value:
Gross Amounts of Recognized Assets	290,659	377,279
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(268,583)	(354,698)
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	22,076	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	22,076	22,581
Options
Trading assets, at fair value:
Gross Amounts of Recognized Assets	2,888	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	2,888	3,485
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	0	0
Counterparty Netting/ Cash Collateral	(2,104)	(2,914)
Net Amount	784	$ 571
Interest rate swap
Trading assets, at fair value:
Gross Amounts of Recognized Assets	5,753
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	0
Net Amounts of Assets Presented in the Condensed Consolidated Statements of Financial Condition	5,753
Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition
Financial Instrument Collateral	0
Counterparty Netting/ Cash Collateral	0
Net Amount	$ 5,753

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-SubTopic 20
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483466/210-20-50-3

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-SubTopic 20
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483444/210-20-55-8

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5C
-Subparagraph (SX 210.12-13C(Column F))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5C

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5B
-Subparagraph (SX 210.12-13B(Column E))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480032/946-320-S99-5B

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B