v3.26.1
RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS (Details) - Donegal Mutual Insurance Company 401(k) Plan [Member] - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS [Abstract]    
Fair value of shares of Donegal Group Inc. common stock held by plan $ 215,196,056 $ 198,201,529
Net realized/unrealized appreciation (depreciation) in fair value of Donegal Group Inc. common stock 25,119,964 21,686,421
Dividends received from Donegal Group Inc. $ 415,559 $ 406,084
Class A Donegal Group Inc. Common Stock [Member]    
RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS [Abstract]    
Number of shares of Donegal Group Inc. common stock held by the plan (in Shares) 471,167 547,422
Fair value of shares of Donegal Group Inc. common stock held by plan $ 9,413,915 $ 8,468,617
Class B Donegal Group Inc. Common Stock [Member]    
RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS [Abstract]    
Number of shares of Donegal Group Inc. common stock held by the plan (in Shares) 52,350 52,352
Fair value of shares of Donegal Group Inc. common stock held by plan $ 926,078 $ 738,690
Class A and Class B Donegal Group Inc. Common Stock [Member]    
RELATED PARTY AND PARTY-IN-INTEREST TRANSACTIONS [Abstract]    
Fair value of shares of Donegal Group Inc. common stock held by plan 10,339,993 9,207,307
Net realized/unrealized appreciation (depreciation) in fair value of Donegal Group Inc. common stock $ 2,663,778 $ 859,360