Transactions with Affiliates, Insurance Subsidiaries Ceded to Donegal Mutual Pursuant to Reinsurance Agreements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reinsurance Pooling and Other Reinsurance Arrangements [Abstract]
Premiums earned	$ 399,284,886	$ 356,669,937	$ 314,859,014
Insurance Subsidiaries [Member]
Reinsurance Pooling and Other Reinsurance Arrangements [Abstract]
Coverage under catastrophic occurrence	5,000,000
Premiums earned	361,300,053	321,311,172	275,126,732
Donegal Mutual [Member]
Reinsurance Pooling and Other Reinsurance Arrangements [Abstract]
Coverage under catastrophic occurrence	2,000,000
Premiums earned	37,996,474	39,315,398	42,079,112
Losses and loss expenses	20,037,608	15,471,037	19,617,787
Liability for losses and loss expenses	36,659,853	35,306,627	36,597,834
Catastrophe Reinsurance [Member] | Insurance Subsidiaries [Member]
Reinsurance Pooling and Other Reinsurance Arrangements [Abstract]
Premiums earned	17,574,161	15,595,138	14,404,636
Losses and loss expenses	9,309,624	25,259,527	13,769,736
Liability for losses and loss expenses	$ 1,658,057	$ 3,812,339	$ 3,149,907