Policy and Claim Reserves (Claims) (Details)	Dec. 31, 2016 USD ($) claim	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2007 USD ($)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	$ 6,347,000
Homeowners, Dwelling Fire and Other Liability [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	311,430,000
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	305,226,000
All outstanding liabilities before 2007, net of reinsurance	88,000
Liabilities for claims and claim adjustment expenses, net of reinsurance	6,292,000
Homeowners, Dwelling Fire and Other Liability [Member] | Accident Year 2007 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	27,333,000	$ 27,433,000	$ 27,422,000	$ 27,341,000	$ 27,343,000	$ 27,356,000	$ 27,415,000	$ 27,636,000	$ 27,990,000	$ 29,056,000
IBNR Reserves	$ 0
Cumulative Number of Reported Claims | claim	5,927
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 27,323,000	27,223,000	27,222,000	27,283,000	27,286,000	27,300,000	27,250,000	27,195,000	27,178,000	$ 24,545,000
Homeowners, Dwelling Fire and Other Liability [Member] | Accident Year 2008 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	39,117,000	39,180,000	39,420,000	39,069,000	39,327,000	38,912,000	38,639,000	38,807,000	40,544,000
IBNR Reserves	$ (56,000)
Cumulative Number of Reported Claims | claim	13,609
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 39,108,000	39,105,000	39,090,000	38,935,000	38,617,000	38,498,000	38,312,000	37,986,000	$ 34,664,000
Homeowners, Dwelling Fire and Other Liability [Member] | Accident Year 2009 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	30,280,000	30,306,000	30,362,000	30,484,000	30,432,000	30,442,000	30,236,000	31,425,000
IBNR Reserves	$ 0
Cumulative Number of Reported Claims | claim	7,989
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 30,280,000	30,274,000	30,265,000	30,004,000	29,847,000	29,869,000	29,281,000	$ 25,245,000
Homeowners, Dwelling Fire and Other Liability [Member] | Accident Year 2010 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	29,641,000	29,672,000	29,687,000	29,718,000	29,805,000	29,918,000	30,610,000
IBNR Reserves	$ 1,000
Cumulative Number of Reported Claims | claim	5,884
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 29,640,000	29,640,000	29,639,000	29,507,000	29,404,000	29,201,000	$ 26,064,000
Homeowners, Dwelling Fire and Other Liability [Member] | Accident Year 2011 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	34,650,000	34,806,000	34,711,000	34,233,000	33,957,000	35,203,000
IBNR Reserves	$ 23,000
Cumulative Number of Reported Claims | claim	8,121
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 34,621,000	34,622,000	34,167,000	33,484,000	33,080,000	$ 31,488,000
Homeowners, Dwelling Fire and Other Liability [Member] | Accident Year 2012 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	29,948,000	30,091,000	30,402,000	30,190,000	29,959,000
IBNR Reserves	$ 69,000
Cumulative Number of Reported Claims | claim	5,188
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 29,834,000	29,765,000	29,614,000	29,135,000	$ 26,162,000
Homeowners, Dwelling Fire and Other Liability [Member] | Accident Year 2013 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	27,023,000	27,076,000	27,147,000	27,436,000
IBNR Reserves	$ 174,000
Cumulative Number of Reported Claims | claim	5,191
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 26,661,000	26,487,000	26,114,000	$ 24,157,000
Homeowners, Dwelling Fire and Other Liability [Member] | Accident Year 2014 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	26,290,000	26,422,000	25,929,000
IBNR Reserves	$ 328,000
Cumulative Number of Reported Claims | claim	4,734
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 25,800,000	25,461,000	22,844,000
Homeowners, Dwelling Fire and Other Liability [Member] | Accident Year 2015 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	30,861,000	31,484,000
IBNR Reserves	$ 694,000
Cumulative Number of Reported Claims | claim	5,826
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 30,066,000	25,923,000
Homeowners, Dwelling Fire and Other Liability [Member] | Accident Year 2016 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	36,287,000
IBNR Reserves	$ 2,386,000
Cumulative Number of Reported Claims | claim	4,909
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 31,893,000
Accident and Health Claim [Member] | Accident Year 2014 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	835,000.000	903,000.000	742,000.000
IBNR Reserves	$ 0.000
Cumulative Number of Reported Claims | claim	1,299
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 836,000	808,000	$ 539,000
Accident and Health Claim [Member] | Accident Year 2015 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	813,000.000	765,000.000
IBNR Reserves	$ 0.000
Cumulative Number of Reported Claims | claim	1,120
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 724,000	$ 568,000
Accident and Health Claim [Member] | Accident Year 2016 [Member]
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Incurred Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	960,000.000
IBNR Reserves	$ 341,000.000
Cumulative Number of Reported Claims | claim	947
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance	$ 657,000