Policy and Claim Reserves (Development to the Liability for Unpaid Claims and Claim Adjustment Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	$ 6,748	$ 6,347
Total reinsurance recoverable on unpaid claims	327	1,184
Insurance lines other than short-duration	0	0
Unallocated claims adjustment expenses	0	0
Other	0	0
Aggregate reconciling items	0	0
Total gross liability for unpaid claims and claim adjustment expense	7,075	7,531
Homeowners' insurance
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	2,384	1,972
Total reinsurance recoverable on unpaid claims	327	889
Dwelling fire insurance
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	2,799	2,938
Total reinsurance recoverable on unpaid claims	0	295
Other Liability insurance
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	1,463	1,382
Total reinsurance recoverable on unpaid claims	0	0
Other short-duration insurance lines
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	102	55
Total reinsurance recoverable on unpaid claims	$ 0	$ 0