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Investments Other Than Temporary Impairments by Asset Type (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Securities
Mar. 31, 2012
Investment Holdings [Line Items]    
Other Than Temporary Impairment, Number of Securities 7  
Other than Temporary Impairment Losses, Investments $ (2,189)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (1,048) (1,100)
Net OTTI losses recognized in operations (3,237) (2,881)
Residential Mortgage Backed Securities [Member]
    
Investment Holdings [Line Items]    
Other Than Temporary Impairment, Number of Securities 5 20
Other than Temporary Impairment Losses, Investments 0 (1,781)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent (1,048) (1,100)
Net OTTI losses recognized in operations (1,048) (2,881)
Equity Securities [Member]
    
Investment Holdings [Line Items]    
Other Than Temporary Impairment, Number of Securities 1  
Other than Temporary Impairment Losses, Investments (428)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 0  
Net OTTI losses recognized in operations (428)  
Corporate Debt Securities, Manufacturing, Construction, and Mining Sectors [Member]
    
Investment Holdings [Line Items]    
Other Than Temporary Impairment, Number of Securities 1  
Other than Temporary Impairment Losses, Investments (1,761)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent 0  
Net OTTI losses recognized in operations $ (1,761)