Related Party Transactions - Other Transactions (Details) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Feb. 15, 2022	Feb. 25, 2021
Related Party Transaction [Line Items]
Receivables from related parties		$ 7,323,000	$ 2,717,000
Related Party
Related Party Transaction [Line Items]
Interest income		$ 13,800,000	15,100,000	$ 7,500,000
Due from related parties, write-offs				$ 600,000
Receivables from related parties			$ 400,000
Subordinated Loan Agreement with Aqua | Related Party
Related Party Transaction [Line Items]
Interest income	$ 0
Aqua | Cantor
Related Party Transaction [Line Items]
Investment ownership percentage		51.00%
Aqua
Related Party Transaction [Line Items]
Increase in authorization amount for loans and investments, other credit support arrangements					$ 1,000,000.0
Authorization amount for loans and investments, other credit support arrangements						$ 21,200,000
Aqua | Subordinated Loan Agreement with Aqua | Related Party
Related Party Transaction [Line Items]
Receivables from related parties		$ 1,000,000.0
Aqua | Aqua | BGC Partners, Inc.
Related Party Transaction [Line Items]
Percentage of ownership interest		49.00%