v3.26.1
FAIR VALUE MEASUREMENTS (Details) - Donegal Mutual Insurance Company 401(k) Plan [Member] - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
FAIR VALUE MEASUREMENTS [Abstract]    
Changes in methodologies used or transfers between levels $ 0 $ 0
Investments 215,196,056 198,201,529
Level 2 [Member]    
FAIR VALUE MEASUREMENTS [Abstract]    
Investments 0 0
Level 3 [Member]    
FAIR VALUE MEASUREMENTS [Abstract]    
Investments $ 0 $ 0