Related Party Transactions (Schedule of Pooling Share Percentages) (Details)	12 Months Ended
	Dec. 31, 2021
Nodak Insurance Company [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total pooling share percentages	66.00%
American West Insurance Company [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total pooling share percentages	7.00%
Primero Insurance Company [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total pooling share percentages	3.00%
Battle Creek Mutual Insurance Company [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total pooling share percentages	2.00%
Direct Auto Insurance Company [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total pooling share percentages	13.00%
Westminster American Insurance Company [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total pooling share percentages	9.00%
Total [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Total pooling share percentages	100.00%