Reinsurance (Reinsurers' Limits of Liability) (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Reinsurance Maintained by Layers [Line Items]
Catastrophe reinsurance retention	$ 4,000,000
Life insurance policy reinsurance limit	50,000
Reinsurance recoverable	278,000	$ 366,000
Single Reinsurer
Reinsurance Maintained by Layers [Line Items]
Reinsurance recoverable	$ 323,000	$ 322,000
First Layer
Reinsurance Maintained by Layers [Line Items]
Percent of reinsured losses covered by layer	100.00%
Covered losses	$ 13,500,000
Reinsurer's limit of liability	$ 17,500,000
Second Layer
Reinsurance Maintained by Layers [Line Items]
Percent of reinsured losses covered by layer	100.00%
Covered losses	$ 25,000,000
Reinsurer's limit of liability	$ 42,500,000
Third Layer
Reinsurance Maintained by Layers [Line Items]
Percent of reinsured losses covered by layer	100.00%
Covered losses	$ 30,000,000
Reinsurer's limit of liability	$ 72,500,000