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Bank Call Loans - Summary of Bank Call Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Bank Call Loans [Abstract] |  |
Year-end balance | $ 82,000 | $ 0
Weighted interest rate (at end of year) | 1.09% | 0.00%
Maximum balance (at any month-end) | $ 203,100 | $ 76,900
Bank Call Loans Average Amount Outstanding | $ 82,760 | $ 11,063
Average interest rate (during the year) | 0.93% | 3.27%

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- Definition Bank Call Loans [Abstract] + References No definition available. + Details
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- Definition Bank Call Loans Average Amount Outstanding + References No definition available. + Details
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- Definition Bank loans maximum balance at any month end. + References No definition available. + Details
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- Definition Weighted average interest rate. + References No definition available. + Details
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- Definition Amount of short-term bank loan secured by broker-dealer customer's security. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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