Financial Assets and Liabilities - Netting of Certain Financial Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Securities loaned
Gross Amounts of Recognized Liabilities	$ 1,142,048	$ 948,256
Amounts Offset in the Consolidated Statements of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition	1,142,048	948,256
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instruments	(1,107,688)	(921,593)
Counterparty Netting/ Cash Collateral	(17,272)	(17,800)
Net Amount	17,088	8,863
Securities sold under agreements to repurchase
Gross Amounts of Recognized Liabilities	514,325	461,235
Amounts Offset in the Consolidated Statements of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition	514,325	461,235
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instruments	(514,325)	(461,235)
Counterparty Netting/ Cash Collateral	0	0
Net Amount	0	0
Trading liabilities, at fair value:
Amounts Offset in the Consolidated Statements of Financial Condition	0	0
Total
Gross Amounts of Recognized Liabilities	1,890,975	1,775,210
Amounts Offset in the Consolidated Statements of Financial Condition	(208,356)	(292,870)
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition	1,682,619	1,482,340
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instruments	(1,622,013)	(1,382,828)
Counterparty Netting/ Cash Collateral	(22,480)	(90,042)
Net Amount	38,126	9,470
Interest rate swap
Securities loaned
Amounts Offset in the Consolidated Statements of Financial Condition	0
Securities sold under agreements to repurchase
Gross Amounts of Recognized Liabilities		63,513
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition		63,513
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instruments		0
Counterparty Netting/ Cash Collateral		(63,162)
Net Amount		351
Trading liabilities, at fair value:
Gross Amounts of Recognized Liabilities	21,037
Amounts Offset in the Consolidated Statements of Financial Condition	0
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition	21,037
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instruments	0
Counterparty Netting/ Cash Collateral	0
Net Amount	21,037
Currency forwards
Securities loaned
Amounts Offset in the Consolidated Statements of Financial Condition	(208,356)	(292,870)
Trading liabilities, at fair value:
Gross Amounts of Recognized Liabilities	208,357	292,965
Amounts Offset in the Consolidated Statements of Financial Condition	(208,356)	(292,870)
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition	1	95
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instruments	0	0
Counterparty Netting/ Cash Collateral	0	0
Net Amount	1	95
Options
Securities loaned
Amounts Offset in the Consolidated Statements of Financial Condition	0	0
Trading liabilities, at fair value:
Gross Amounts of Recognized Liabilities	5,208	9,241
Amounts Offset in the Consolidated Statements of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition	5,208	9,241
Amounts Not Offset in the Consolidated Statements of Financial Condition
Financial Instruments	0	0
Counterparty Netting/ Cash Collateral	(5,208)	(9,080)
Net Amount	$ 0	$ 161