Reinsurance (Summary of Net Reinsurance Balances Recoverable) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 10,118,373	$ 9,951,880
Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 15,167,000
Percent of Total	100.00%
Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 10,118,000
Percent of Total	100.00%
All Other Reinsurers Including Anticipated Subrogation [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,959,000
Percent of Total	12.90%
All Other Reinsurers Including Anticipated Subrogation [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 2,422,000
Percent of Total	23.90%
AM Best, A++ Rating [Member] | General Reinsurance Corporation [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 677,000
Percent of Total	4.50%
AM Best, A++ Rating [Member] | General Reinsurance Corporation [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 1,364,000
Percent of Total	13.50%
AM Best, A+ Rating [Member] | Platinum Underwriters [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 2,724,000
Percent of Total	18.00%
AM Best, A+ Rating [Member] | Platinum Underwriters [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 1,988,000
Percent of Total	19.60%
AM Best, A+ Rating [Member] | Hannover Ruckversicherungs [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,961,000
Percent of Total	12.90%
AM Best, A+ Rating [Member] | Hannover Ruckversicherungs [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 1,592,000
Percent of Total	15.70%
AM Best, A+ Rating [Member] | Everest Reinsurance Company [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,684,000
Percent of Total	11.10%
AM Best, A+ Rating [Member] | Everest Reinsurance Company [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 878,000
Percent of Total	8.70%
AM Best, A+ Rating [Member] | Partner Reinsurance Company [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,495,000
Percent of Total	9.90%
AM Best, A+ Rating [Member] | Partner Reinsurance Company [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 249,000
Percent of Total	2.50%
AM Best, A+ Rating [Member] | Swiss Reinsurance [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,230,000
Percent of Total	8.10%
AM Best, A+ Rating [Member] | Swiss Reinsurance [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 274,000
Percent of Total	2.70%
AM Best, A+ Rating [Member] | Endurance Reinsurance [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 591,000
Percent of Total	3.90%
AM Best, A+ Rating [Member] | Endurance Reinsurance [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 276,000
Percent of Total	2.70%
AM Best, A Rating [Member] | Aspen Insurance UK Ltd [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,570,000
Percent of Total	10.40%
AM Best, A Rating [Member] | Aspen Insurance UK Ltd [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 268,000
Percent of Total	2.60%
AM Best, A Rating [Member] | XL Reinsurance [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 699,000
Percent of Total	4.60%
AM Best, A Rating [Member] | XL Reinsurance [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Percent of Total	0.10%
AM Best, A Rating [Member] | Liberty Mutual Insurance Company [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 577,000
Percent of Total	3.80%
AM Best, A Rating [Member] | Liberty Mutual Insurance Company [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 807,000
Percent of Total	8.00%