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Policy and Claim Reserves (Claims) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
claim
Dec. 31, 2016
USD ($)
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 ($)
Dec. 31, 2008
USD ($)
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 $ 6,748 $ 6,347                
Accident Year 2015                    
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 736 813 $ 765              
IBNR Reserves $ 0                  
Cumulative Number of Reported Claims | claim 1,122                  
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 736 724 568              
Accident Year 2016                    
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 962 960                
IBNR Reserves $ 0                  
Cumulative Number of Reported Claims | claim 1,175,000                  
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 874 658                
Accident Year 2017                    
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 1,008                  
IBNR Reserves $ 367                  
Cumulative Number of Reported Claims | claim 1,266                  
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 725                  
Homeowners, Dwelling Fire and Other Liability                    
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 322,927                  
Homeowners, Dwelling Fire and Other Liability | Accident Year 2008                    
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 39,115 39,117 39,180 $ 39,420 $ 39,069 $ 39,327 $ 38,912 $ 38,639 $ 38,807 $ 40,544
IBNR Reserves $ 0                  
Cumulative Number of Reported Claims | claim 13,609,000                  
Homeowners, Dwelling Fire and Other Liability | Accident Year 2009                    
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 30,280 30,306 30,362 30,484 30,432 30,442 30,236 31,425  
IBNR Reserves $ 0                  
Cumulative Number of Reported Claims | claim 7,992,000                  
Homeowners, Dwelling Fire and Other Liability | Accident Year 2010                    
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 $ 29,660 29,641 29,672 29,687 29,718 29,805 29,918 30,610    
IBNR Reserves $ 0                  
Cumulative Number of Reported Claims | claim 5,886,000                  
Homeowners, Dwelling Fire and Other Liability | Accident Year 2011                    
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 $ 34,658 34,650 34,806 34,711 34,233 33,957 35,203      
IBNR Reserves $ 8                  
Cumulative Number of Reported Claims | claim 8,125,000                  
Homeowners, Dwelling Fire and Other Liability | Accident Year 2012                    
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 $ 29,885 29,948 30,091 30,402 30,190 29,959        
IBNR Reserves $ 28                  
Cumulative Number of Reported Claims | claim 5,190,000                  
Homeowners, Dwelling Fire and Other Liability | Accident Year 2013                    
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 $ 27,191 27,023 27,076 27,147 27,436          
IBNR Reserves $ 277                  
Cumulative Number of Reported Claims | claim 5,198,000                  
Homeowners, Dwelling Fire and Other Liability | Accident Year 2014                    
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 $ 26,225 26,290 26,422 25,929            
IBNR Reserves $ 105                  
Cumulative Number of Reported Claims | claim 4,744,000                  
Homeowners, Dwelling Fire and Other Liability | Accident Year 2015                    
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 $ 30,360 30,861 31,484              
IBNR Reserves $ 120                  
Cumulative Number of Reported Claims | claim 5,836,000                  
Homeowners, Dwelling Fire and Other Liability | Accident Year 2016                    
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 $ 35,343 36,287                
IBNR Reserves $ 384                  
Cumulative Number of Reported Claims | claim 5,178,000                  
Homeowners, Dwelling Fire and Other Liability | Accident Year 2017                    
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 $ 40,210                  
IBNR Reserves $ 2,990                  
Cumulative Number of Reported Claims | claim 5,087,000                  
Accident and Health Claim                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 316,469                  
All outstanding liabilities before 2008, net of reinsurance 188                  
Liabilities for claims and claim adjustment expenses, net of reinsurance 6,646                  
Accident and Health Claim | Accident Year 2008                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 39,111 39,108 39,105 39,090 38,935 38,617 38,498 38,312 37,986 $ 34,664
Accident and Health Claim | Accident Year 2009                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 30,280 30,280 30,274 30,265 30,004 29,847 29,869 29,281 $ 25,245  
Accident and Health Claim | Accident Year 2010                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 29,660 29,640 29,640 29,639 29,507 29,404 29,201 $ 26,064    
Accident and Health Claim | Accident Year 2011                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 34,641 34,621 34,622 34,167 33,484 33,080 $ 31,488      
Accident and Health Claim | Accident Year 2012                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 29,835 29,834 29,765 29,614 29,135 $ 26,162        
Accident and Health Claim | Accident Year 2013                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 26,788 26,661 26,487 26,114 $ 24,157          
Accident and Health Claim | Accident Year 2014                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 26,033 25,800 25,461 $ 22,844            
Accident and Health Claim | Accident Year 2015                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 30,190 30,066 $ 25,923              
Accident and Health Claim | Accident Year 2016                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance 34,722 $ 31,893                
Accident and Health Claim | Accident Year 2017                    
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]                    
Cumulative Paid Claims and Allocated Claims Adjustment Expenses, Net of Reinsurance $ 35,209