Reinsurance (Summary of Net Reinsurance Balances Recoverable) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 7,952,661	$ 8,111,446
Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 11,183,000
Percent of Total	100.00%
Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 7,953,000
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	$ (2,529,000)
Percent of Total	(22.60%)
All Other Reinsurers Including Anticipated Subrogation [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 1,546,000
Percent of Total	19.40%
AM Best, A+ Rating [Member] | Everest Reinsurance Company [Member] | Standard & Poor's, A+ Rating [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 2,700,000
Percent of Total	24.10%
AM Best, A+ Rating [Member] | Everest Reinsurance Company [Member] | Standard & Poor's, A+ Rating [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 856,000
Percent of Total	10.80%
AM Best, A+ Rating [Member] | Hannover Ruckversicherungs [Member] | Standard & Poor's, AA- Rating [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,885,000
Percent of Total	16.90%
AM Best, A+ Rating [Member] | Hannover Ruckversicherungs [Member] | Standard & Poor's, AA- Rating [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 1,114,000
Percent of Total	14.00%
AM Best, A+ Rating [Member] | Arch Reinsurance Company [Member] | Standard & Poor's, A+ Rating [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,241,000
Percent of Total	11.10%
AM Best, A+ Rating [Member] | Arch Reinsurance Company [Member] | Standard & Poor's, A+ Rating [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 86,000
Percent of Total	1.10%
AM Best, A+ Rating [Member] | Swiss Reinsurance [Member] | Standard & Poor's, AA- Rating [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,120,000
Percent of Total	10.00%
AM Best, A+ Rating [Member] | Swiss Reinsurance [Member] | Standard & Poor's, AA- Rating [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 385,000
Percent of Total	4.80%
AM Best, A Rating [Member] | Aspen Insurance UK Ltd [Member] | Standard & Poor's, A Rating [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 2,111,000
Percent of Total	18.90%
AM Best, A Rating [Member] | Aspen Insurance UK Ltd [Member] | Standard & Poor's, A Rating [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 1,308,000
Percent of Total	16.40%
AM Best, A Rating [Member] | Partner Reinsurance Company [Member] | Standard & Poor's, A+ Rating [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,268,000
Percent of Total	11.30%
AM Best, A Rating [Member] | Partner Reinsurance Company [Member] | Standard & Poor's, A+ Rating [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 461,000
Percent of Total	5.80%
AM Best, A Rating [Member] | Platinum Underwriters [Member] | Standard & Poor's, A- Rating [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,169,000
Percent of Total	10.50%
AM Best, A Rating [Member] | Platinum Underwriters [Member] | Standard & Poor's, A- Rating [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 765,000
Percent of Total	9.60%
AM Best, A Rating [Member] | Toa Reinsurance Company [Member] | Standard & Poor's, A+ Rating [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 1,017,000
Percent of Total	9.10%
AM Best, A Rating [Member] | Toa Reinsurance Company [Member] | Standard & Poor's, A+ Rating [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 2,000
Percent of Total	0.00%
AM Best, A Rating [Member] | Allied World Reinsurance [Member] | Standard & Poor's, A Rating [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 680,000
Percent of Total	6.10%
AM Best, A Rating [Member] | Allied World Reinsurance [Member] | Standard & Poor's, A Rating [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 883,000
Percent of Total	11.10%
AM Best, A Rating [Member] | Endurance [Member] | Standard & Poor's, A Rating [Member] | Net Reinsurer Exposure [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Net Reinsurer Exposure	$ 521,000
Percent of Total	4.70%
AM Best, A Rating [Member] | Endurance [Member] | Standard & Poor's, A Rating [Member] | Ceded Premiums Written [Member] | Reinsurer Concentration Risk [Member]
Ceded Credit Risk [Line Items]
Ceded Premiums Written	$ 547,000
Percent of Total	6.90%