v3.26.3
Balance Sheet Offsetting - Secured Borrowings (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2026
USD ($)
item
Dec. 31, 2025
USD ($)
item
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Number of repurchase-to-maturity transactions outstanding | item 0 0
Total $ 1,773,206 $ 1,763,938
Gross amount of recognized liabilities for repurchase agreement and securities lending transactions in offsetting disclosure above $ 1,773,206 $ 1,763,938
Minimum    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Security repurchase agreement maturity period 1 day 1 day
Maximum    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Security repurchase agreement maturity period 90 days 90 days
Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Total $ 1,579,892 $ 1,558,945
Up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Total 193,314 204,993
Asset-backed securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreement transactions 272,819 266,697
Asset-backed securities | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreement transactions 79,505 61,704
Asset-backed securities | Up to 30 Days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreement transactions 193,314 204,993
Other    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreement transactions 15,824 2,108
Other | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Repurchase agreement transactions 15,824 2,108
Corporate securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities lending transactions 52 52
Corporate securities | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities lending transactions 52 52
Equity Securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities lending transactions 1,484,511 1,495,081
Equity Securities | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities lending transactions $ 1,484,511 $ 1,495,081