v3.26.1
Fair Value Measurements - Schedule of Financial Assets and Liabilities not Measured at Fair Value (Details) - USD ($)
Jun. 30, 2026
Dec. 31, 2025
Financial assets, not measured at fair value    
Cash and cash equivalents $ 16,099,000 $ 22,408,000
Cash – segregated for regulatory purposes 126,745,000 151,007,000
Securities borrowed 619,576,000 408,495,000
Receivables from customers 88,581,000 73,465,000
Receivables from non-customers 1,821,000 1,773,000
Receivables from broker-dealers and clearing organizations 18,078,000 6,801,000
Notes receivable 2,350,000  
Other receivables 6,404,000 4,522,000
Deposits with broker-dealers and clearing organizations 6,365,000 5,503,000
Total financial assets, not measured at fair value 886,019,000 673,974,000
Financial liabilities, not measured at fair value    
Securities loaned 609,796,000 407,258,000
Payables to customers 237,457,000 237,193,000
Payables to non-customers 6,000 7,000
Drafts payable 809,000 2,829,000
Payables to broker-dealers and clearing organizations 7,428,000 769,000
Debt 9,094,000 9,139,000
Contract termination liability   819,000
Total financial liabilities, not measured at fair value 864,590,000 658,014,000
Level 1 [Member]    
Financial assets, not measured at fair value    
Cash and cash equivalents 16,099,000 22,408,000
Cash – segregated for regulatory purposes 126,745,000 151,007,000
Securities borrowed
Receivables from customers
Receivables from non-customers
Receivables from broker-dealers and clearing organizations
Notes receivable  
Other receivables
Deposits with broker-dealers and clearing organizations
Total financial assets, not measured at fair value 142,844,000 173,415,000
Financial liabilities, not measured at fair value    
Securities loaned
Payables to customers
Payables to non-customers
Drafts payable
Payables to broker-dealers and clearing organizations
Debt
Contract termination liability  
Total financial liabilities, not measured at fair value
Level 2 [Member]    
Financial assets, not measured at fair value    
Cash and cash equivalents
Cash – segregated for regulatory purposes
Securities borrowed 619,576,000 408,495,000
Receivables from customers 88,581,000 73,465,000
Receivables from non-customers 1,821,000 1,773,000
Receivables from broker-dealers and clearing organizations 18,078,000 6,801,000
Notes receivable 2,350,000  
Other receivables 6,404,000 4,522,000
Deposits with broker-dealers and clearing organizations 6,365,000 5,503,000
Total financial assets, not measured at fair value 743,175,000 500,559,000
Financial liabilities, not measured at fair value    
Securities loaned 609,796,000 407,258,000
Payables to customers 237,457,000 237,193,000
Payables to non-customers 6,000 7,000
Drafts payable 809,000 2,829,000
Payables to broker-dealers and clearing organizations 7,428,000 769,000
Debt 9,094,000 9,139,000
Contract termination liability   819,000
Total financial liabilities, not measured at fair value 864,590,000 658,014,000
Level 3 [Member]    
Financial assets, not measured at fair value    
Cash and cash equivalents
Cash – segregated for regulatory purposes
Securities borrowed
Receivables from customers
Receivables from non-customers
Receivables from broker-dealers and clearing organizations
Notes receivable  
Other receivables
Deposits with broker-dealers and clearing organizations
Total financial assets, not measured at fair value
Financial liabilities, not measured at fair value    
Securities loaned
Payables to customers
Payables to non-customers
Drafts payable
Payables to broker-dealers and clearing organizations
Debt
Contract termination liability  
Total financial liabilities, not measured at fair value
Fair Value [Member]    
Financial assets, not measured at fair value    
Cash and cash equivalents 16,099,000 22,408,000
Cash – segregated for regulatory purposes 126,745,000 151,007,000
Securities borrowed 619,576,000 408,495,000
Receivables from customers 88,581,000 73,465,000
Receivables from non-customers 1,821,000 1,773,000
Receivables from broker-dealers and clearing organizations 18,078,000 6,801,000
Notes receivable 2,350,000  
Other receivables 6,404,000 4,522,000
Deposits with broker-dealers and clearing organizations 6,365,000 5,503,000
Total financial assets, not measured at fair value 886,019,000 673,974,000
Financial liabilities, not measured at fair value    
Securities loaned 609,796,000 407,258,000
Payables to customers 237,457,000 237,193,000
Payables to non-customers 6,000 7,000
Drafts payable 809,000 2,829,000
Payables to broker-dealers and clearing organizations 7,428,000 769,000
Debt 9,094,000 9,139,000
Contract termination liability   819,000
Total financial liabilities, not measured at fair value $ 864,590,000 $ 658,014,000