Reinsurance And Policy Benefits And Losses Claims And Loss Expenses Payable (Cumulative Paid Claims And Allocated Claim Adjustment Expense Net Of Reinsurance) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	$ 85,747
All outstanding liabilities before 2012, net of reinsurance	85,101
Liabilities for claims and claim adjustment expenses, net of reinsurance	113,090
Accident Year 2014 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	10,327	$ 10,327	$ 10,325	$ 9,293	$ 9,270	$ 8,087	$ 6,154
Accident Year 2015 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	11,092	11,087	10,343	9,730	9,601	$ 7,509
Accident Year 2016 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	11,764	11,746	11,643	10,665	$ 7,777
Accident Year 2017 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	15,012	14,825	11,638	$ 8,970
Accident Year 2018 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	15,150	12,698	$ 8,838
Accident Year 2019 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	14,737	$ 7,366
Accident Year 2020 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Cumulative Paid Claims And Allocated Claim Adjustment Expense Net	$ 7,665