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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items]    
Securities Owned and Sold, Not yet Purchased, at Fair Value, Security Owned, Including Disposal Group Securities Owned $ 561,683 $ 610,517
Fair Value, Nonrecurring [Member]    
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items]    
Other 3,444 15,622
Receivable from customers 1,273,445 1,110,835
Fair Value, Estimate Not Practicable, Investment 93,175 85,552
Clearing organizations 32,914 28,955
Securities loaned 286,180 249,499
Fair Value, Estimate not Practicable, Due from Employees 55,098 46,161
Total Receivable from brokers, dealers and clearing organizations 242,519 203,482
Securities failed to receive 22,493 6,218
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 15,379 4,102
Bank call loans 72,300 82,000
Receivables from brokers 34,143 30,133
Securities failed to deliver 52,402 17,840
Securities borrowed 119,616 110,932
Deposits with clearing organization 57,196 59,352
Other   70
Total payables to brokers, dealers and clearing organizations 324,052 259,889
Payables to customers 551,419 502,807
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase 343,925 342,438
Fair Value, Estimate not Practicable, Senior Secured Notes 131,263 127,033
Fair Value, Estimate Not Practicable, Cash 140,819 35,424
Fair Value, Nonrecurring [Member] | Carrying Value [Member]    
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items]    
Other 3,444 15,622
Receivable from customers 1,273,445 1,110,835
Fair Value, Estimate Not Practicable, Investment 93,175 85,552
Clearing organizations 32,914 28,955
Securities loaned 286,180 249,499
Fair Value, Estimate not Practicable, Due from Employees 55,098 46,161
Total Receivable from brokers, dealers and clearing organizations 242,519 203,482
Securities failed to receive 22,493 6,218
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 15,379 4,102
Bank call loans 72,300 82,000
Receivables from brokers 34,143 30,133
Securities failed to deliver 52,402 17,840
Securities borrowed 119,616 110,932
Deposits with clearing organization 57,196 59,352
Other   70
Total payables to brokers, dealers and clearing organizations 324,052 259,889
Payables to customers 551,419 502,807
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase 343,925 342,438
Fair Value, Estimate not Practicable, Senior Secured Notes 125,000 125,000
Fair Value, Estimate Not Practicable, Cash 140,819 35,424
Fair Value, Nonrecurring [Member] | Level 1    
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items]    
Deposits with clearing organization 57,196 59,352
Fair Value, Estimate Not Practicable, Cash 140,819 35,424
Fair Value, Nonrecurring [Member] | Level 2    
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items]    
Other 3,444 15,622
Receivable from customers 1,273,445 1,110,835
Fair Value, Estimate Not Practicable, Investment 93,175 85,552
Clearing organizations 32,914 28,955
Securities loaned 286,180 249,499
Fair Value, Estimate not Practicable, Due from Employees 55,098 46,161
Total Receivable from brokers, dealers and clearing organizations 242,519 203,482
Securities failed to receive 22,493 6,218
Fair Value Estimate Not Practicable Payable to Correspondent Brokers 15,379 4,102
Bank call loans 72,300 82,000
Receivables from brokers 34,143 30,133
Securities failed to deliver 52,402 17,840
Securities borrowed 119,616 110,932
Other   70
Total payables to brokers, dealers and clearing organizations 324,052 259,889
Payables to customers 551,419 502,807
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase 343,925 342,438
Fair Value, Estimate not Practicable, Senior Secured Notes $ 131,263 $ 127,033