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Fair value measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities purchased under agreements to resell | $ 4,090 | $ 5,842
Corporate-owned life insurance | 95,241 | 88,989
Securities Sold | 520,932 | 31,676
Mortgage Backed Securities, Other |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities Sold | 0 |
Level 1 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities purchased under agreements to resell |  | 0
Securities Sold | 498,667 | 28,030
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 purchased under agreements to resell |  | 5,842
Securities Sold | 22,265 | 3,646
Level 2 | Mortgage Backed Securities, Other |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities Sold | 0 |
Level 3 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Securities purchased under agreements to resell |  | 0
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 | 27,661 | 28,835
Deposits with clearing organizations | 58,791 | 43,917
Securities borrowed | 147,647 | 158,612
Receivables from brokers | 57,579 | 65,639
Securities failed to deliver | 20,171 | 29,656
Clearing organizations and other | 35,066 | 30,780
Total Receivable from brokers, dealers and clearing organizations | 260,463 | 284,687
Receivable from customers | 1,179,700 | 1,059,892
Notes receivable, net | 66,889 | 62,640
Securities purchased under agreements to resell | 4,090 |
Investments | 97,299 | 90,999
Corporate-owned life insurance | 95,200 | 89,000
Drafts payable | 21,459 | 9,002
Bank call loans | 94,350 |
Securities loaned | 298,002 | 284,987
Payable to brokers | 779 | 447
Securities failed to receive | 25,573 | 23,809
Clearing organization and other | 171,298 | 51,912
Total payables to brokers, dealers and clearing organizations | 495,652 | 361,155
Payables to customers | 447,627 | 369,287
Securities sold under agreements to repurchase | 286,455 | 640,382
Senior secured notes | 111,617 | 109,838
Fair Value, Nonrecurring | Level 1 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Cash and cash equivalents | 27,661 | 28,835
Deposits with clearing organizations | 58,791 | 43,917
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
Securities purchased under agreements to resell | 0 |
Investments | 0 | 0
Drafts payable | 21,459 | 9,002
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
Deposits with clearing organizations | 0 | 0
Securities borrowed | 147,647 | 158,612
Receivables from brokers | 57,579 | 65,639
Securities failed to deliver | 20,171 | 29,656
Clearing organizations and other | 35,066 | 30,780
Total Receivable from brokers, dealers and clearing organizations | 260,463 | 284,687
Receivable from customers | 1,179,700 | 1,059,892
Notes receivable, net | 66,889 | 62,640
Securities purchased under agreements to resell | 4,090 |
Investments | 97,299 | 90,999
Drafts payable | 0 | 0
Bank call loans | 94,350 |
Securities loaned | 298,002 | 284,987
Payable to brokers | 779 | 447
Securities failed to receive | 25,573 | 23,809
Clearing organization and other | 171,298 | 51,912
Total payables to brokers, dealers and clearing organizations | 495,652 | 361,155
Payables to customers | 447,627 | 369,287
Securities sold under agreements to repurchase | 286,455 | 640,382
Senior secured notes | 111,617 | 109,838
Fair Value, Nonrecurring | Level 3 |  |
Financial Instruments, Estimate Not Practicable, Fair Value [Line Items] |  |
Cash and cash equivalents | 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
Securities purchased under agreements to resell |  |
Investments | 0 | 0
Drafts payable | 0 | 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 | 27,661 | 28,835
Deposits with clearing organizations | 58,791 | 43,917
Securities borrowed | 147,647 | 158,612
Receivables from brokers | 57,579 | 65,639
Securities failed to deliver | 20,171 | 29,656
Clearing organizations and other | 35,066 | 30,780
Total Receivable from brokers, dealers and clearing organizations | 260,463 | 284,687
Receivable from customers | 1,179,700 | 1,059,892
Notes receivable, net | 66,889 | 62,640
Securities purchased under agreements to resell | 4,090 |
Investments | 97,299 | 90,999
Drafts payable | 21,459 | 9,002
Bank call loans | 94,350 |
Securities loaned | 298,002 | 284,987
Payable to brokers | 779 | 447
Securities failed to receive | 25,573 | 23,809
Clearing organization and other | 171,298 | 51,912
Total payables to brokers, dealers and clearing organizations | 495,652 | 361,155
Payables to customers | 447,627 | 369,287
Securities sold under agreements to repurchase | 286,455 | 640,382
Senior secured notes | $ 113,050 | $ 113,050

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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 Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483466/210-20-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483444/210-20-55-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(2)(i)(A)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(3)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + 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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