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Investments (Number of Securities in an Unrealized Unrecognized Loss Position) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Number of securities in an unrealized/unrecognized loss position 141  
Unrealized Unrecognized Loss $ 10,635,000 $ 21,557,000
Aggregate unrealized loss position 5,747,000 [1] 11,572,000 [1]
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss 4,900,000 8,600,000
Non-Credit OTTI Charges 2,100,000  
Decline in fair value percentage 6.00%  
Eighty Percent to Ninety-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 140 193
Unrealized Unrecognized Loss 10,166,000 16,310,000
Sixty Percent to Seventy-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 0 2
Unrealized Unrecognized Loss 0 1,125,000
Forty Percent to Fifty-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 1 2
Unrealized Unrecognized Loss 469,000 2,160,000
Twenty Percent to Thirty-Nine Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 0 1
Unrealized Unrecognized Loss 0 986,000
Zero Percent to Nineteen Percent [Member]
    
Number of securities in an unrealized/unrecognized loss position 0 1
Unrealized Unrecognized Loss 0 976,000
Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss   5,800,000
Commercial Mortgage-backed Securities ("CMBS") [Member] | Previously Impaired Securities With Further Impairment [Member]
    
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss   3,700,000
Commercial Mortgage-backed Securities ("CMBS") [Member] | Unrealized Unrecognized Losses On Securities Without Non Credit Impairment [Member]
    
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss   2,100,000
Decline in fair value percentage   17.00%
Residential Mortgage Backed Securities And Asset Backed Securities [Member]
    
Decline in fair value percentage   5.00%
Number of securities in an unrealized/unrecognized loss position for more than twelve months   16
Equity Securities [Member]
    
Aggregate unrealized loss position 88,000 [1] 0 [1]
Municipal Securities, Residential Mortgage Backed Securities, and Asset Backed Securities [Member]
    
Securities In Unrealized Unrecognized Loss Position For More Than Twelve Months Unrealized Unrecognized Loss   $ 2,800,000
Number of securities in an unrealized/unrecognized loss position for more than twelve months   37
Obligations of States and Political Subdivisions [Member]
    
Number of securities in an unrealized/unrecognized loss position for more than twelve months   21
[1] Gross unrealized losses include non-OTTI unrealized amounts and OTTI losses recognized in AOCI. In addition, this column includes remaining unrealized gain or loss amounts on securities that were transferred to an HTM designation in the first quarter of 2009 for those securities that are in a net unrealized/unrecognized loss position.