Unpaid Losses and Settlement Expenses (Narrative) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items]
Increase in net unpaid losses and settlement expense	$ 988,000
Increase in net unpaid losses and settlement expense, percent	2.10%
Liquor Liability And Business Owners Liability [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Increase in net unpaid losses and settlement expense	$ 1,231,000
Liquor Liability And Umbrella Liability [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Increase in net unpaid losses and settlement expense		$ 2,511,000