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Reinsurance (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Maximum Retention of Life Insurance Face Amount $ 100,000      
Contracts in Force Subject to Participation Through Reinsurance, Percentage 100.00%      
Maximum Amount of Casualty Reinsurance for Second Catastrophy 10,000,000      
Reinsurance Deductible for Second Catastrophy 500,000      
Percentage Amount of Coinsurance for Accident and Health Insurance Reinsurance 1.00      
Reinsurance Recoverable on Claims Payable and Future Policy Benefit Reserves for a specific reinsurer 4,900,000      
Aggregate ceded life insurance in force (466,898,000) (462,220,000)    
Direct reinsurance premiums 175,547,000 167,087,000 159,119,000  
Assumed reinsurance premiums 1,275,000 1,874,000 1,553,000  
Ceded reinsurance premiums (6,948,000) (7,566,000) (8,620,000)  
Net reinsurance premiums earned 163,170,000 154,778,000 145,665,000  
Premiums Earned, Net 169,873,000 161,395,000 152,052,000  
Claims and surrenders assumed 1,313,000 1,865,000 1,549,000  
Claims and surrenders ceded (5,486,000) (3,204,000) (5,341,000)  
Reinsurance Recoverables 1,188,000 1,171,000 1,188,000 2,455,000
Payments for Reinsurance 1,000,000 1,100,000 1,100,000  
Reinsurance Recoverable on Claims Payable and Future Policy Benefit Reserves 9,651,000 9,562,000    
Premiums from short-duration contracts
        
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Direct reinsurance premiums 7,274,000 7,227,000 6,994,000  
Assumed reinsurance premiums 0 0 0  
Ceded reinsurance premiums (1,034,000) (1,128,000) (1,131,000)  
Net reinsurance premiums earned 6,240,000 6,099,000 5,863,000  
Premiums from long-duration contracts
        
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Direct reinsurance premiums 168,272,000 159,860,000 152,125,000  
Assumed reinsurance premiums 1,275,000 1,874,000 1,553,000  
Ceded reinsurance premiums (5,914,000) (6,438,000) (7,489,000)  
Net reinsurance premiums earned $ 163,633,000 $ 155,296,000 $ 146,189,000