Policy and Claim Reserves (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Insurance [Abstract]
Estimated claims and claim adjustment expenses for claims arising in prior years	$ 1,213,000	$ 1,460,000
Reserve for unpaid claims	367,000	391,000
Policy and contract claims	$ 903,000	1,008,000
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Average annual payout of incurred claims settled within twelve months	72.50%
Homeowners, Dwelling Fire and Other Liability
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Average annual payout of incurred claims settled within twelve months	87.70%
Average annual payout of incurred claims settled within twenty four months	97.20%
Catastrophe
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Claims and claim adjustment expense payments for claims arising in prior year	$ 115,000	$ 462,000