Markel Fronting Arrangement - Changes in the Deposit Liability (Details) $ in Thousands	3 Months Ended
Mar. 31, 2026 USD ($)
Changes In The Deposit Liability [Roll Forward]
Beginning balance	$ 50,500
Amortization of deferred gain	(1,308)
Claim payments	(9,248)
Ending balance	$ 39,944

The current portion, due within one year or one operating cycle, if longer, of deposits held other than customer deposits.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Name:	us-gaap_DepositLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant