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Fair value measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities Sold | $ 45,577 | $ 52,768
Mortgage Backed Securities, Other |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities Sold | 143 |
Level 1 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities Sold | 23,518 | 36,384
Level 1 | Mortgage Backed Securities, Other |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities Sold | 0 |
Level 2 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities Sold | 22,059 | 16,384
Level 2 | Mortgage Backed Securities, Other |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities Sold | 143 |
Level 3 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities Sold | 0 | 0
Level 3 | Mortgage Backed Securities, Other |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities Sold | 0 |
Fair Value, Nonrecurring |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Cash and cash equivalents | 30,773 | 112,433
Restricted cash | 25,949 | 25,534
Deposits with clearing organizations | 53,957 | 52,754
Securities borrowed | 142,544 | 127,817
Receivables from brokers | 45,021 | 49,125
Securities failed to deliver | 20,203 | 9,099
Clearing organizations and other | 51,599 | 20,035
Total Receivable from brokers, dealers and clearing organizations | 259,367 | 206,076
Receivable from customers | 1,087,314 | 1,202,764
Notes receivable, net | 61,270 | 57,495
Investments | 85,606 | 79,322
Company-owned life insurance policies | 84,000 | 77,000
Drafts payable | 14,521 |
Bank call loans | 56,200 |
Securities loaned | 292,860 | 320,843
Payable to brokers | 1,337 | 123
Securities failed to receive | 29,031 | 62,646
Clearing organization and other | 25,243 | 166,350
Total payables to brokers, dealers and clearing organizations | 348,471 | 549,962
Payables to customers | 363,839 | 456,475
Securities sold under agreements to repurchase | 680,064 | 161,009
Senior secured notes | 108,084 | 113,233
Fair Value, Nonrecurring | Level 1 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Cash and cash equivalents | 30,773 | 112,433
Restricted cash | 25,949 | 25,534
Deposits with clearing organizations | 53,957 | 52,754
Securities borrowed | 0 | 0
Receivables from brokers | 0 | 0
Securities failed to deliver | 0 | 0
Clearing organizations and other | 0 | 0
Total Receivable from brokers, dealers and clearing organizations | 0 | 0
Receivable from customers | 0 | 0
Notes receivable, net | 0 | 0
Investments | 0 | 0
Drafts payable | 14,521 |
Bank call loans | 0 |
Securities loaned | 0 | 0
Payable to brokers | 0 | 0
Securities failed to receive | 0 | 0
Clearing organization and other | 0 | 0
Total payables to brokers, dealers and clearing organizations | 0 | 0
Payables to customers | 0 | 0
Securities sold under agreements to repurchase | 0 | 0
Senior secured notes | 0 | 0
Fair Value, Nonrecurring | Level 2 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Deposits with clearing organizations | 0 | 0
Securities borrowed | 142,544 | 127,817
Receivables from brokers | 45,021 | 49,125
Securities failed to deliver | 20,203 | 9,099
Clearing organizations and other | 51,599 | 20,035
Total Receivable from brokers, dealers and clearing organizations | 259,367 | 206,076
Receivable from customers | 1,087,314 | 1,202,764
Notes receivable, net | 61,270 | 57,495
Investments | 85,606 | 79,322
Drafts payable | 0 |
Bank call loans | 56,200 |
Securities loaned | 292,860 | 320,843
Payable to brokers | 1,337 | 123
Securities failed to receive | 29,031 | 62,646
Clearing organization and other | 25,243 | 166,350
Total payables to brokers, dealers and clearing organizations | 348,471 | 549,962
Payables to customers | 363,839 | 456,475
Securities sold under agreements to repurchase | 680,064 | 161,009
Senior secured notes | 108,084 | 113,233
Fair Value, Nonrecurring | Level 3 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Deposits with clearing organizations | 0 | 0
Securities borrowed | 0 | 0
Receivables from brokers | 0 | 0
Securities failed to deliver | 0 | 0
Clearing organizations and other | 0 | 0
Total Receivable from brokers, dealers and clearing organizations | 0 | 0
Receivable from customers | 0 | 0
Notes receivable, net | 0 | 0
Investments | 0 | 0
Drafts payable | 0 |
Bank call loans | 0 |
Securities loaned | 0 | 0
Payable to brokers | 0 | 0
Securities failed to receive | 0 | 0
Clearing organization and other | 0 | 0
Total payables to brokers, dealers and clearing organizations | 0 | 0
Payables to customers | 0 | 0
Securities sold under agreements to repurchase | 0 | 0
Senior secured notes | 0 | 0
Carrying Value | Fair Value, Nonrecurring |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Cash and cash equivalents | 30,773 | 112,433
Restricted cash | 25,949 | 25,534
Deposits with clearing organizations | 53,957 | 52,754
Securities borrowed | 142,544 | 127,817
Receivables from brokers | 45,021 | 49,125
Securities failed to deliver | 20,203 | 9,099
Clearing organizations and other | 51,599 | 20,035
Total Receivable from brokers, dealers and clearing organizations | 259,367 | 206,076
Receivable from customers | 1,087,314 | 1,202,764
Notes receivable, net | 61,270 | 57,495
Investments | 85,606 | 79,322
Drafts payable | 14,521 |
Bank call loans | 56,200 |
Securities loaned | 292,860 | 320,843
Payable to brokers | 1,337 | 123
Securities failed to receive | 29,031 | 62,646
Clearing organization and other | 25,243 | 166,350
Total payables to brokers, dealers and clearing organizations | 348,471 | 549,962
Payables to customers | 363,839 | 456,475
Securities sold under agreements to repurchase | 680,064 | 161,009
Senior secured notes | $ 113,050 | $ 114,050

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- Definition This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 325 -SubTopic 30 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481612/325-30-25-1 + Details
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- Definition Fair value of financial instruments sold short by a broker-dealer for their own account (proprietary securities) for trading or investment purposes determined by management based upon quoted prices of a financial instrument with similar characteristics or on a valuation technique or model. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481961/940-320-45-2 + Details
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