v3.26.1
Organization (Details)
$ in Millions
6 Months Ended
Sep. 09, 2025
USD ($)
Jun. 30, 2026
Segment
Organization [Abstract]    
Number of operating segments (in Segment) | Segment   3
Premiums ceded to other party (in Dollars) | $ $ 6  
Donegal Mutual Insurance Company [Member]    
Organization [Abstract]    
Voting power percentage of outstanding common stock   71.00%
Premiums and losses related to certain products   100.00%
Atlantic States [Member]    
Organization [Abstract]    
Percentage of share in results of pooled business subsidiary   80.00%
Class A Common Stock [Member] | Donegal Mutual Insurance Company [Member]    
Organization [Abstract]    
Stock ownership percentage held by major shareholder   45.00%
Class B Common Stock [Member] | Donegal Mutual Insurance Company [Member]    
Organization [Abstract]    
Stock ownership percentage held by major shareholder   85.00%