Reinsurance (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Reinsurance Transactions [Abstract]
Loss reinsurance agreement contracts retention amount	$ 3.0
Workers' compensation and retention amount	2.0
Property Insurance [Member]
Reinsurance Transactions [Abstract]
Catastrophe reinsurance, set retention amount	3.0
Maximum amount of loss coverage under reinsurance agreement of property catastrophe	37.0
Liability Insurance [Member]
Reinsurance Transactions [Abstract]
Catastrophe reinsurance, set retention amount	3.0
Maximum amount of loss coverage under reinsurance agreement of property catastrophe	72.0
Workers' Compensation Insurance [Member]
Reinsurance Transactions [Abstract]
Catastrophe reinsurance, set retention amount	2.0
Maximum amount of loss coverage under reinsurance agreement of property catastrophe	$ 18.0
Third Party Reinsurance [Member]
Reinsurance Transactions [Abstract]
Percentage of accumulation of losses	100.00%
Catastrophe reinsurance, set retention amount	$ 25.0
Maximum amount of loss coverage under reinsurance agreement of property catastrophe	$ 175.0
Atlantic States [Member]
Reinsurance Transactions [Abstract]
Percentage of share in results of pooled business subsidiary	80.00%
Donegal Mutual [Member]
Reinsurance Transactions [Abstract]
Percentage of share in results of pooled business owned by third party	20.00%
Percentage of accumulation of losses	100.00%
Catastrophe reinsurance, set retention amount	$ 3.0
Maximum amount of loss coverage under reinsurance agreement of property catastrophe	22.0
Additional coverage amount	$ 6.0