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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

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