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Financial Assets and Liabilities - Not Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets    
Cash restricted or segregated under regulations and other $ 47,547 $ 41,478
Receivables from broker-dealers and clearing organizations 2,633,329 1,100,850
Receivables from customers 192,463 149,804
Other assets 716,071 357,740
Liabilities    
Payables to broker-dealers and clearing organizations 1,677,016 918,566
Payables to customers 78,944 46,112
Quoted Prices in Active Markets for Identical Assets (Level 1)     
Assets    
Cash and cash equivalents 707,865 872,513
Cash restricted or segregated under regulations and other 47,547 41,478
Securities borrowed 0 0
Securities purchased under agreements to resell 0 0
Receivables from broker-dealers and clearing organizations 0 0
Receivables from customers 0 0
Other assets 15,229 11,121
Total Assets 770,641 925,112
Liabilities    
Short-term borrowings 0 0
Long-term borrowings 0 0
Securities loaned 0 0
Securities sold under agreements to repurchase 0 0
Payables to broker-dealers and clearing organizations 0 0
Payables to customers 0 0
Other liabilities 0 0
Total Liabilities 0 0
Significant Other Observable Inputs (Level 2)     
Assets    
Cash and cash equivalents 0 0
Cash restricted or segregated under regulations and other 0 0
Securities borrowed 3,098,666 2,294,529
Securities purchased under agreements to resell 1,266,106 983,941
Receivables from broker-dealers and clearing organizations 2,545,715 1,049,255
Receivables from customers 192,463 149,804
Other assets 22,567 20,605
Total Assets 7,125,517 4,498,134
Liabilities    
Short-term borrowings 125,000 38,541
Long-term borrowings 2,086,763 1,788,719
Securities loaned 2,973,523 2,431,878
Securities sold under agreements to repurchase 1,276,677 1,271,788
Payables to broker-dealers and clearing organizations 1,230,845 781,830
Payables to customers 78,944 46,112
Other liabilities 37,834 26,114
Total Liabilities 7,809,586 6,384,982
Significant Unobservable Inputs (Level 3)     
Assets    
Cash and cash equivalents 0 0
Cash restricted or segregated under regulations and other 0 0
Securities borrowed 0 0
Securities purchased under agreements to resell 0 0
Receivables from broker-dealers and clearing organizations 0 0
Receivables from customers 0 0
Other assets 0 0
Total Assets 0 0
Liabilities    
Short-term borrowings 0 0
Long-term borrowings 0 0
Securities loaned 0 0
Securities sold under agreements to repurchase 0 0
Payables to broker-dealers and clearing organizations 0 0
Payables to customers 0 0
Other liabilities 0 0
Total Liabilities 0 0
Carrying Value    
Assets    
Cash and cash equivalents 707,865 872,513
Cash restricted or segregated under regulations and other 47,547 41,478
Securities borrowed 3,098,666 2,294,529
Securities purchased under agreements to resell 1,266,106 983,941
Receivables from broker-dealers and clearing organizations 2,545,715 1,049,255
Receivables from customers 192,463 149,804
Other assets 37,796 31,726
Total Assets 7,896,158 5,423,246
Liabilities    
Short-term borrowings 121,991 38,541
Long-term borrowings 2,039,490 1,740,467
Securities loaned 2,973,523 2,431,878
Securities sold under agreements to repurchase 1,276,677 1,271,788
Payables to broker-dealers and clearing organizations 1,230,845 781,830
Payables to customers 78,944 46,112
Other liabilities 37,834 26,114
Total Liabilities 7,759,304 6,336,730
Fair Value    
Assets    
Cash and cash equivalents 707,865 872,513
Cash restricted or segregated under regulations and other 47,547 41,478
Securities borrowed 3,098,666 2,294,529
Securities purchased under agreements to resell 1,266,106 983,941
Receivables from broker-dealers and clearing organizations 2,545,715 1,049,255
Receivables from customers 192,463 149,804
Other assets 37,796 31,726
Total Assets 7,896,158 5,423,246
Liabilities    
Short-term borrowings 125,000 38,541
Long-term borrowings 2,086,763 1,788,719
Securities loaned 2,973,523 2,431,878
Securities sold under agreements to repurchase 1,276,677 1,271,788
Payables to broker-dealers and clearing organizations 1,230,845 781,830
Payables to customers 78,944 46,112
Other liabilities 37,834 26,114
Total Liabilities $ 7,809,586 $ 6,384,982