v3.26.1
Fair value measurements - Schedule of Level 3 Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance $ 323,930 $ 282,589 $ 282,270 $ 257,265
Purchases 16,890 30,371 53,085 56,094
Sales and repayments (34,675) (27,999) (59,706) (40,489)
Net realized gain (loss) 74 (568) (629) (508)
Included in income (1,553) 5,770 (4,459) 6,048
Included in OCI 1,324 (178) 2,605 (278)
Transfer in 0 6,000 32,824 17,853
Transfer out (5,000)   (5,000)  
Ending Balance 300,990 295,985 300,990 295,985
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held (1,906) 1,188 (5,048) 1,150
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held $ 1,324 (179) $ 2,605 (278)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   503    
Net realized gain (loss)   0    
Included in income   (371)    
Ending Balance   132   $ 132
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held   $ 371    
Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List Not Disclosed Flag Included in OCI   Included in income  
Fair Value Asset Recurring Basis Still Held Unrealized Gain Loss Statement Of Income Extensible List Not Disclosed Flag   Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held   Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held
Variable Interest Entity, Primary Beneficiary        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance     $ 120,680  
Ending Balance $ 130,722   130,722  
Consolidated Balance Including Variable Interest Entity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 317,219 $ 277,217 275,701 $ 256,766
Purchases 16,890 30,371 53,085 51,094
Sales and repayments (34,675) (27,980) (59,692) (40,470)
Net realized gain (loss) 74 (568) (632) (508)
Included in income (1,150) 5,274 (4,209) 5,679
Included in OCI 1,324 (178) 2,605 (278)
Transfer in 0 6,000 32,824 17,853
Transfer out (5,000)   (5,000)  
Ending Balance 294,682 290,136 294,682 290,136
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held (1,503) 728 (4,800) 806
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held 1,324 $ (179) 2,605 $ (278)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag   Included in OCI   Included in OCI
Asset Management        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 6,711 $ 5,372 6,569 $ 499
Purchases       5,000
Sales and repayments   (19) (14) (19)
Net realized gain (loss)     3  
Included in income (403) 496 (250) 369
Ending Balance 6,308 5,849 6,308 5,849
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held $ (403) 460 $ (248) 344
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   503   1,471
Net realized gain (loss)   0   0
Included in income   (371)   (1,339)
Ending Balance   132   132
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held   371   1,339
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag Included in OCI   Included in income  
Asset Management | Debt obligations        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance   503   1,471
Net realized gain (loss)   0   0
Included in income   (371)   (1,339)
Ending Balance   132   132
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held   371   1,339
Asset Management | Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance $ 6,640 5,372 $ 6,484 499
Purchases       5,000
Sales and repayments   (19)   (19)
Included in income (403) 496 (247) 369
Ending Balance 6,237 5,849 6,237 5,849
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held (403) 460 (247) 344
Asset Management | Derivatives        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance     13  
Sales and repayments     (14)  
Net realized gain (loss)     3  
Included in income     (2)  
Ending Balance 0   0  
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held     0  
Asset Management | Other invested assets        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 71   72  
Included in income 0   (1)  
Ending Balance 71   71  
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 0   (1)  
Insurance Solutions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 186,909 144,824 155,021 130,868
Purchases 679 14,291 1,506 17,142
Sales and repayments (19,847) (8,464) (22,585) (9,537)
Net realized gain (loss) 15 (745) 15 (745)
Included in income (120) 5,355 (426) 5,780
Included in OCI 1,324 (178) 2,605 (278)
Transfer in 0 6,000 32,824 17,853
Transfer out (5,000)   (5,000)  
Ending Balance 163,960 161,083 163,960 161,083
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held (234) 1,191 (560) 1,595
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held 1,324 (179) 2,605 (278)
Insurance Solutions | Consolidated Balance Including Variable Interest Entity        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance     275,701  
Ending Balance 294,682   294,682  
Insurance Solutions | Equity securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 3,319 2,931 3,240 2,918
Purchases 0      
Sales and repayments (3,001) 0 (3,001) 0
Included in income (17) 69 62 82
Transfer in 0   0  
Ending Balance 301 3,000 301 3,000
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held (17) 69 62 82
Insurance Solutions | Equity securities | Variable Interest Entity, Primary Beneficiary        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 1,139 141 949 141
Purchases 38 0 530 0
Sales and repayments 0 0   0
Net realized gain (loss) 0 0   0
Included in income (61) 106 (363) 106
Ending Balance 1,116 247 1,116 247
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held (61) 106 (363) 106
Insurance Solutions | Other invested assets        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 5,143 4,006 5,637 4,575
Purchases 7   45  
Sales and repayments (5) (4,433) (6) (4,433)
Net realized gain (loss) 0 (745)   (745)
Included in income (138) 4,633 (145) 4,260
Included in OCI (258) (299) (834) (495)
Transfer in 0   52  
Ending Balance 4,749 3,162 4,749 3,162
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held (139) 475 (144) 84
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held (258) (299) (834) (495)
Insurance Solutions | Corporate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 15,208 5,039 10,149  
Included in OCI (207) 28 (148) 67
Transfer in 0 0 5,000 5,000
Transfer out (5,000)   (5,000)  
Ending Balance 10,001 5,067 10,001 5,067
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held (207) 28 (148) 67
Insurance Solutions | Asset and mortgage-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 41,281 15,323 19,427 8,641
Purchases 19   19  
Sales and repayments (2,826) (302) (3,038) (530)
Net realized gain (loss) 15   15  
Included in income 95 0 91 (1)
Included in OCI 1,789 92 3,587 150
Transfer in 0 0 20,272 6,853
Ending Balance 40,373 15,113 40,373 15,113
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held 1,789 92 3,587 150
Insurance Solutions | Corporate loans        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 121,958 117,525 116,568 114,734
Purchases 653 14,291 1,442 17,142
Sales and repayments (14,015) (3,729) (16,540) (4,574)
Net realized gain (loss) 0 0   0
Included in income (60) 653 (434) 1,439
Included in OCI   1    
Transfer in 0 6,000 7,500 6,000
Ending Balance 108,536 134,741 108,536 134,741
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held (78) 647 (478) 1,429
Insurance Solutions | Corporate loans | Variable Interest Entity, Primary Beneficiary        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance 129,171 132,252 119,731 125,757
Purchases 16,173 16,080 51,049 33,952
Sales and repayments (14,828) (19,516) (37,107) (30,933)
Net realized gain (loss) 59 177 (647) 237
Included in income (969) (187) (3,420) (207)
Ending Balance 129,606 128,806 129,606 128,806
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held $ (1,208) $ (569) $ (3,877) $ (895)