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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 605,330 | $ 610,517
Fair Value, Nonrecurring [Member] |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 717 | 15,622
Receivable from customers | 1,152,499 | 1,110,835
Fair Value, Estimate Not Practicable, Investment | 88,963 | 85,552
Drafts payable | 12,392 |
Clearing organizations | 28,221 | 28,955
Securities loaned | 257,342 | 249,499
Fair Value, Estimate not Practicable, Due from Employees | 48,847 | 46,161
Total Receivable from brokers, dealers and clearing organizations | 233,888 | 203,482
Securities failed to receive | 38,100 | 6,218
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 1,336 | 4,102
Bank call loans | 75,100 | 82,000
Receivables from brokers | 32,994 | 30,133
Securities failed to deliver | 62,193 | 17,840
Securities borrowed | 109,763 | 110,932
Deposits with clearing organization | 51,395 | 59,352
Other | 124,339 | 70
Total payables to brokers, dealers and clearing organizations | 421,117 | 259,889
Payables to customers | 462,450 | 502,807
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 7,150 | 342,438
Fair Value, Estimate not Practicable, Senior Secured Notes | 129,375 | 127,033
Fair Value, Estimate Not Practicable, Cash | 28,545 | 35,424
Fair Value, Nonrecurring [Member] | Carrying Value [Member] |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 717 | 15,622
Receivable from customers | 1,152,499 | 1,110,835
Fair Value, Estimate Not Practicable, Investment | 88,963 | 85,552
Drafts payable | 12,392 |
Clearing organizations | 28,221 | 28,955
Securities loaned | 257,342 | 249,499
Fair Value, Estimate not Practicable, Due from Employees | 48,847 | 46,161
Total Receivable from brokers, dealers and clearing organizations | 233,888 | 203,482
Securities failed to receive | 38,100 | 6,218
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 1,336 | 4,102
Bank call loans | 75,100 | 82,000
Receivables from brokers | 32,994 | 30,133
Securities failed to deliver | 62,193 | 17,840
Securities borrowed | 109,763 | 110,932
Deposits with clearing organization | 51,395 | 59,352
Other | 124,339 | 70
Total payables to brokers, dealers and clearing organizations | 421,117 | 259,889
Payables to customers | 462,450 | 502,807
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 7,150 | 342,438
Fair Value, Estimate not Practicable, Senior Secured Notes | 125,000 | 125,000
Fair Value, Estimate Not Practicable, Cash | 28,545 | 35,424
Fair Value, Nonrecurring [Member] | Level 1 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Drafts payable | 12,392 |
Deposits with clearing organization | 51,395 | 59,352
Fair Value, Estimate Not Practicable, Cash | 28,545 | 35,424
Fair Value, Nonrecurring [Member] | Level 2 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 717 | 15,622
Receivable from customers | 1,152,499 | 1,110,835
Fair Value, Estimate Not Practicable, Investment | 88,963 | 85,552
Clearing organizations | 28,221 | 28,955
Securities loaned | 257,342 | 249,499
Fair Value, Estimate not Practicable, Due from Employees | 48,847 | 46,161
Total Receivable from brokers, dealers and clearing organizations | 233,888 | 203,482
Securities failed to receive | 38,100 | 6,218
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 1,336 | 4,102
Bank call loans | 75,100 | 82,000
Receivables from brokers | 32,994 | 30,133
Securities failed to deliver | 62,193 | 17,840
Securities borrowed | 109,763 | 110,932
Other | 124,339 | 70
Total payables to brokers, dealers and clearing organizations | 421,117 | 259,889
Payables to customers | 462,450 | 502,807
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 7,150 | 342,438
Fair Value, Estimate not Practicable, Senior Secured Notes | $ 129,375 | $ 127,033

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