Receivables from and Payables to Brokers, Dealers and Clearing Organizations - Amounts Receivable from and Payable to Brokers, Dealers and Clearing Organizations (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Receivables from brokers, dealers and clearing organizations
Receivable from clearing organizations	$ 199,143	$ 285,957
Receivable from brokers and dealers	9,176	10,942
Other	3,685	3,564
Total receivables from brokers, dealers and clearing organizations	212,004	300,463
Payables to brokers, dealers and clearing organizations
Payable to brokers and dealers	979	4,622
Total payables to brokers, dealers and clearing organizations	$ 979	$ 4,622