Financial commitments and contingent liabilities - Undrawn Commitments (Details) $ in Thousands |
Mar. 31, 2025
USD ($)
|
Dec. 31, 2024
USD ($)
|
|---|---|---|
| Commitments and Contingencies Disclosure [Abstract] | ||
| Exchange rate | 1.2910 | 1.2529 |
| Definitive | $ 985,953 | $ 962,808 |
| Discretionary | 879,362 | 1,032,433 |
| Legal risk (definitive) | 42,969 | 41,318 |
| Total capital provision undrawn commitments | $ 1,908,284 | $ 2,036,559 |