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Fair value measurements - Assets and Liabilities Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Corporate-owned life insurance | $ 98,828 | $ 88,989
Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 33,150 | 28,835
Deposits with clearing organizations | 70,838 | 43,917
Securities borrowed | 137,177 | 158,612
Receivables from brokers | 59,487 | 65,639
Securities failed to deliver | 8,459 | 29,656
Clearing organizations and other | 36,355 | 30,780
Total Receivable from brokers, dealers and clearing organizations | 241,478 | 284,687
Receivable from customers | 1,268,866 | 1,059,892
Notes receivable, net | 67,931 | 62,640
Corporate-owned life insurance | 98,828 | 88,989
Investments | 1,634 | 2,010
Drafts payable | 21,661 | 9,002
Bank call loans | 252,100 |
Securities loaned | 235,498 | 284,987
Payable to brokers | 607 | 447
Securities failed to receive | 14,757 | 23,809
Clearing Organizations and Other | 1,883 | 51,912
Total payables to brokers, dealers and clearing organizations | 252,745 | 361,155
Payables to customers | 357,835 | 369,287
Securities sold under agreements to repurchase | 931,754 | 640,382
Senior secured notes |  | 109,838
Nonrecurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 33,150 | 28,835
Deposits with clearing organizations | 70,838 | 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
Corporate-owned life insurance |  |
Investments | 0 | 0
Drafts payable | 21,661 | 9,002
Bank call loans | 0 |
Securities loaned | 0 | 0
Payable to brokers | 0 | 0
Securities failed to receive | 0 | 0
Clearing Organizations 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
Nonrecurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Deposits with clearing organizations | 0 | 0
Securities borrowed | 137,177 | 158,612
Receivables from brokers | 59,487 | 65,639
Securities failed to deliver | 8,459 | 29,656
Clearing organizations and other | 36,355 | 30,780
Total Receivable from brokers, dealers and clearing organizations | 241,478 | 284,687
Receivable from customers | 1,268,866 | 1,059,892
Notes receivable, net | 67,931 | 62,640
Corporate-owned life insurance | 98,828 | 88,989
Investments | 1,634 | 2,010
Drafts payable | 0 | 0
Bank call loans | 252,100 |
Securities loaned | 235,498 | 284,987
Payable to brokers | 607 | 447
Securities failed to receive | 14,757 | 23,809
Clearing Organizations and Other | 1,883 | 51,912
Total payables to brokers, dealers and clearing organizations | 252,745 | 361,155
Payables to customers | 357,835 | 369,287
Securities sold under agreements to repurchase | 931,754 | 640,382
Senior secured notes |  | 109,838
Nonrecurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [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
Corporate-owned life insurance |  |
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 Organizations 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
Nonrecurring | Carrying Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 33,150 | 28,835
Deposits with clearing organizations | 70,838 | 43,917
Securities borrowed | 137,177 | 158,612
Receivables from brokers | 59,487 | 65,639
Securities failed to deliver | 8,459 | 29,656
Clearing organizations and other | 36,355 | 30,780
Total Receivable from brokers, dealers and clearing organizations | 241,478 | 284,687
Receivable from customers | 1,268,866 | 1,059,892
Notes receivable, net | 67,931 | 62,640
Corporate-owned life insurance | 98,828 | 88,989
Investments | 1,634 | 2,010
Drafts payable | 21,661 | 9,002
Bank call loans | 252,100 |
Securities loaned | 235,498 | 284,987
Payable to brokers | 607 | 447
Securities failed to receive | 14,757 | 23,809
Clearing Organizations and Other | 1,883 | 51,912
Total payables to brokers, dealers and clearing organizations | 252,745 | 361,155
Payables to customers | 357,835 | 369,287
Securities sold under agreements to repurchase | $ 931,754 | 640,382
Senior secured notes |  | $ 113,050

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