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Fair value - Schedule of Additional Information about Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance $ 333,408 $ 305,977 $ 331,484 $ 319,261
Total realized and unrealized gains (losses) included in net income (8,403) 13 (8,729) (720)
Total realized and unrealized gains (losses) included in OCI 18,687 (5,021) 14,680 (3,570)
Purchases 6,249 19,658 29,183 54,408
Sales (17,937) (3) (19,685) (10,445)
Settlements (327) (506) (14,227) (36,302)
Transfer into Level 3 0 11,377 4,651 11,377
Transfer out of Level 3 (29,997) (17,298) (35,677) (19,812)
Ending Balance 301,680 314,197 301,680 314,197
Total gains (losses) attributable to assets still held included in net income 113 5 132 10
Total gains (losses) attributable to assets still held included in OCI 7,209 (4,674) 2,951 (5,673)
U.S. corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 237,448 222,301 247,205 220,626
Total realized and unrealized gains (losses) included in net income (7,176) (7) (7,535) (28)
Total realized and unrealized gains (losses) included in OCI 16,456 (3,625) 14,504 (3,622)
Purchases 0 18,001 0 39,001
Sales 0 (2) (1,739) (6,901)
Settlements (222) (344) (10,580) (12,752)
Transfer into Level 3 0 0 4,651 0
Transfer out of Level 3 (13,592) 0 (13,592) 0
Ending Balance 232,914 236,324 232,914 236,324
Total gains (losses) attributable to assets still held included in net income 82 (7) 67 (23)
Total gains (losses) attributable to assets still held included in OCI 7,081 (3,627) 4,895 (4,720)
Non-U.S. corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 82,053 72,724 81,321 95,154
Total realized and unrealized gains (losses) included in net income (1,236) 6 (1,220) (711)
Total realized and unrealized gains (losses) included in OCI 1,803 (1,288) (261) 170
Purchases 0 2 6,000 3,761
Sales (17,937) 0 (17,946) (3,543)
Settlements (105) (105) (3,316) (23,492)
Transfer into Level 3 0 11,377 0 11,377
Transfer out of Level 3 (2,994) (7,448) (2,994) (7,448)
Ending Balance 61,584 75,268 61,584 75,268
Total gains (losses) attributable to assets still held included in net income 22 6 39 22
Total gains (losses) attributable to assets still held included in OCI 110 (1,043) (1,963) (921)
Other asset-backed        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 13,907 10,952 2,958 3,481
Total realized and unrealized gains (losses) included in net income 9 14 26 19
Total realized and unrealized gains (losses) included in OCI 428 (108) 437 (118)
Purchases 6,249 1,655 23,183 11,646
Sales 0 (1) 0 (1)
Settlements 0 (57) (331) (58)
Transfer into Level 3 0 0 0 0
Transfer out of Level 3 (13,411) (9,850) (19,091) (12,364)
Ending Balance 7,182 2,605 7,182 2,605
Total gains (losses) attributable to assets still held included in net income 9 6 26 11
Total gains (losses) attributable to assets still held included in OCI $ 18 $ (4) $ 19 $ (32)