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Fair Value Measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
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 | $ 646,680 | $ 799,719
Fair Value, Nonrecurring [Member] |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 1,184 | 1,316
Receivable from customers | 1,095,035 | 796,934
Fair Value, Estimate Not Practicable, Investment | 75,785 | 73,971
Drafts payable | 18,251 |
Clearing organizations | 34,165 | 36,269
Securities loaned | 291,969 | 234,343
Fair Value, Estimate not Practicable, Due from Employees | 44,723 | 43,670
Total Receivable from brokers, dealers and clearing organizations | 207,201 | 163,417
Securities failed to receive | 19,421 | 14,603
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 2,280 | 4,548
Bank call loans | 156,900 |
Receivables from brokers | 29,088 | 19,024
Securities failed to deliver | 14,565 | 7,173
Securities borrowed | 128,199 | 99,635
Deposits with clearing organization | 41,858 | 23,297
Other | 53,163 | 267,214
Total payables to brokers, dealers and clearing organizations | 366,833 | 520,708
Payables to customers | 380,746 | 334,735
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 252,827 | 287,265
Fair Value, Estimate not Practicable, Senior Secured Notes | 126,111 | 154,988
Fair Value, Estimate Not Practicable, Cash | 32,080 | 79,550
Fair Value, Nonrecurring [Member] | Carrying Value [Member] |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 1,184 | 1,316
Receivable from customers | 1,095,035 | 796,934
Fair Value, Estimate Not Practicable, Investment | 75,785 | 73,971
Drafts payable | 18,251 |
Clearing organizations | 34,165 | 36,269
Securities loaned | 291,969 | 234,343
Fair Value, Estimate not Practicable, Due from Employees | 44,723 | 43,670
Total Receivable from brokers, dealers and clearing organizations | 207,201 | 163,417
Securities failed to receive | 19,421 | 14,603
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 2,280 | 4,548
Bank call loans | 156,900 |
Receivables from brokers | 29,088 | 19,024
Securities failed to deliver | 14,565 | 7,173
Securities borrowed | 128,199 | 99,635
Deposits with clearing organization | 41,858 | 23,297
Other | 53,163 | 267,214
Total payables to brokers, dealers and clearing organizations | 366,833 | 520,708
Payables to customers | 380,746 | 334,735
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 252,827 | 287,265
Fair Value, Estimate not Practicable, Senior Secured Notes | 125,000 | 150,000
Fair Value, Estimate Not Practicable, Cash | 32,080 | 79,550
Fair Value, Nonrecurring [Member] | Level 1 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Drafts payable | 18,251 |
Deposits with clearing organization | 41,858 | 23,297
Fair Value, Estimate Not Practicable, Cash | 32,080 | 79,550
Fair Value, Nonrecurring [Member] | Level 2 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Other | 1,184 | 1,316
Receivable from customers | 1,095,035 | 796,934
Fair Value, Estimate Not Practicable, Investment | 75,785 | 73,971
Clearing organizations | 34,165 | 36,269
Securities loaned | 291,969 | 234,343
Fair Value, Estimate not Practicable, Due from Employees | 44,723 | 43,670
Total Receivable from brokers, dealers and clearing organizations | 207,201 | 163,417
Securities failed to receive | 19,421 | 14,603
Fair Value Estimate Not Practicable Payable to Correspondent Brokers | 2,280 | 4,548
Bank call loans | 156,900 |
Receivables from brokers | 29,088 | 19,024
Securities failed to deliver | 14,565 | 7,173
Securities borrowed | 128,199 | 99,635
Other | 53,163 | 267,214
Total payables to brokers, dealers and clearing organizations | 366,833 | 520,708
Payables to customers | 380,746 | 334,735
Fair Value,Estimate not Practicable, Securities sold under Agreements to Repurchase | 252,827 | 287,265
Fair Value, Estimate not Practicable, Senior Secured Notes | $ 126,111 | $ 154,988

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