Employee stock ownership plan - Additional Information (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
Jan. 01, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2024 |
Dec. 31, 2025 |
|
| Employee stock ownership plan | |||||||
| Distribution period | 3 years | ||||||
| Employee stock ownership plan (ESOP) first tier diversification percentage | 50.00% | 25.00% | |||||
| Employee stock ownership plan (ESOP) age in years for first tier diversification percentage | 50 years | ||||||
| Employee stock ownership plan (ESOP0 number of years of service | 10 years | 10 years | |||||
| Employee Stock Ownership Plan ESOP Age In Years For Second Tier Diversification Percentage | 55 years | ||||||
| Employee stock ownership plan (ESOP0 second tier diversification percentage | 75.00% | 50.00% | |||||
| Shares in ESOP | 1,557,606 | 1,557,606 | 1,903,861 | ||||
| Employee Stock Option | |||||||
| Employee stock ownership plan | |||||||
| Employee stock ownership plan (ESOP), (income) expense | $ 0 | $ 0 | $ 0 | $ 0 | |||