Unpaid Losses and Settlement Expenses (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Liability for Future Policy Benefit, by Product Segment [Line Items]
Increase in net unpaid losses and settlement expense	$ 841,000
Increase in net unpaid losses and settlement expense, percent	1.80%
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	$ 661,000
Liquor Liability And Umbrella Liability [Member]
Liability for Future Policy Benefit, by Product Segment [Line Items]
Increase in net unpaid losses and settlement expense		$ 1,597,000