Retained earnings (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Retained earnings | ||||
| Statutory accounting practices statutory surplus required percentage | 10.00% | |||
| Percentage of statutory surplus reserve | 50.00% | |||
| Statutory accounting practices statutory capital and surplus required | $ 0 | $ 0 | ||
| Statutory accounting practices statutory capital and surplus reserve | $ 0 | $ 0 | $ 1,500 | $ 300 |