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Bank call loans - Schedule of Bank Call Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Bank Call Loans [Abstract] |  |  |
Year-end balance | $ 0 | $ 69,500 | [1]
Weighted interest rate (at end of year) (as a percent) | 0.00% | 0.96% |
Maximum balance (at any month-end) | $ 179,200 | $ 117,800 |
Average amount outstanding (during the year) | $ 79,366 | $ 76,412 |
Average interest rate (during the year) (as a percent) | 2.18% | 0.95% |
[1] | (1) Certain prior period reported amounts were reclassified to conform to the current period presentation, See Note 2.

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- Definition Average interest rates. + References No definition available. + Details
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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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Period Type: | instant