v3.26.1
Fair value measurements - Schedule of Level 3 Rollforward (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Financial assets    
Beginning Balance $ 257,265 $ 246,847
Purchases 118,628 159,577
Sales and repayments (176,171) (185,816)
Net realized gain (loss) (1,135) 194
Included in income 7,692 (6,762)
Included in OCI 370 (1,565)
Transfer in 75,621 44,790
Ending Balance 282,270 257,265
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 2,203 (8,883)
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held 370 (1,565)
Financial liabilities    
Beginning Balance $ 1,471  
Ending Balance   $ 1,471
Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Income Extensible List Not Disclosed Flag 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
Variable Interest Entity, Primary Beneficiary    
Financial assets    
Beginning Balance $ 125,898  
Ending Balance 120,680 $ 125,898
Consolidated Balance Including Variable Interest Entity    
Financial assets    
Beginning Balance 256,766 245,177
Purchases 112,599 159,577
Sales and repayments (174,830) (185,816)
Net realized gain (loss) (1,135) 194
Included in income 6,310 (5,591)
Included in OCI 370 (1,565)
Transfer in 75,621 44,790
Ending Balance 275,701 256,766
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 792 (7,712)
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held 370 $ (1,565)
Financial liabilities    
Fair Value Recurring Basis Unobservable Input Reconciliation Asset Gain Loss Statement Of Other Comprehensive Income Extensible List Not Disclosed Flag   Included in OCI
Asset Management    
Financial assets    
Beginning Balance 499 $ 1,670
Purchases 6,029  
Sales and repayments (1,341)  
Included in income 1,382 (1,171)
Ending Balance 6,569 499
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 1,411 (1,171)
Financial liabilities    
Beginning Balance 1,471 1,175
Sales and repayments (132)  
Net realized gain (loss)   296
Included in income (1,339) 0
Ending Balance 0 1,471
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held $ 1,339 (296)
Fair Value Recurring Basis Unobservable Input Reconciliation Liability Gain Loss Statement Of Income Extensible List Not Disclosed Flag Included in income  
Asset Management | Debt obligations    
Financial liabilities    
Beginning Balance $ 1,471 1,175
Sales and repayments (132)  
Net realized gain (loss)   296
Included in income (1,339) 0
Ending Balance 0 1,471
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 1,339 (296)
Asset Management | Equity securities    
Financial assets    
Beginning Balance 499 1,670
Purchases 5,946  
Sales and repayments (1,341)  
Included in income 1,380 (1,171)
Ending Balance 6,484 499
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 1,409 (1,171)
Asset Management | Other invested assets    
Financial assets    
Purchases 72  
Ending Balance 72  
Asset Management | Derivatives    
Financial assets    
Purchases 11  
Included in income 2  
Ending Balance 13  
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 2  
Insurance Solutions    
Financial assets    
Beginning Balance 130,868 120,540
Purchases 20,453 41,474
Sales and repayments (78,533) (69,950)
Net realized gain (loss) (749) 87
Included in income 6,991 (4,508)
Included in OCI 370 (1,565)
Transfer in 75,621 44,790
Ending Balance 155,021 130,868
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 2,807 (4,542)
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held 370 (1,565)
Insurance Solutions | Consolidated Balance Including Variable Interest Entity    
Financial assets    
Beginning Balance 256,766  
Ending Balance 275,701 256,766
Insurance Solutions | Corporate    
Financial assets    
Included in OCI 149  
Transfer in 10,000  
Ending Balance 10,149  
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held 149  
Insurance Solutions | Equity securities    
Financial assets    
Beginning Balance 2,918 3,107
Sales and repayments   (250)
Included in income (43) 61
Transfer in 365  
Ending Balance 3,240 2,918
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held (43) 61
Insurance Solutions | Equity securities | Variable Interest Entity, Primary Beneficiary    
Financial assets    
Beginning Balance 141 0
Purchases 825 131
Sales and repayments (104) 0
Included in income 87 10
Ending Balance 949 141
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 88 10
Insurance Solutions | Asset and mortgage-backed securities    
Financial assets    
Beginning Balance 8,641 2,240
Purchases 756  
Sales and repayments (6,280) (1,008)
Included in income (59) (3)
Included in OCI 356 (23)
Transfer in 16,013 7,435
Ending Balance 19,427 8,641
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held 356 (23)
Insurance Solutions | Corporate loans    
Financial assets    
Beginning Balance 114,734 104,588
Purchases 19,678 41,474
Sales and repayments (67,820) (68,113)
Net realized gain (loss) (4) 85
Included in income 1,858 (655)
Transfer in 48,122 37,355
Ending Balance 116,568 114,734
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 1,834 (348)
Insurance Solutions | Corporate loans | Variable Interest Entity, Primary Beneficiary    
Financial assets    
Beginning Balance 125,757 124,637
Purchases 91,321 117,972
Sales and repayments (96,193) (115,866)
Net realized gain (loss) (386) 107
Included in income (768) (1,093)
Ending Balance 119,731 125,757
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held (2,103) (3,180)
Insurance Solutions | Other invested assets    
Financial assets    
Beginning Balance 4,575 10,605
Purchases 19  
Sales and repayments (4,433) (579)
Net realized gain (loss) (745) 2
Included in income 5,235 (3,911)
Included in OCI (135) (1,542)
Transfer in 1,121  
Ending Balance 5,637 4,575
Change in unrealized gains (losses) included in income on Level 3 assets and liabilities still held 1,016 (4,255)
Change in unrealized gains (losses) included in OCI on Level 3 assets and liabilities still held $ (135) $ (1,542)