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Investments (Fair Value and Gross Pre-Tax Net Unrealized Unrecognized Loss of Securities By Length of Time) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
AFS Fair Value, Less than 12 months $ 217,502 $ 524,328
AFS Unrealized Losses, Less than 12 months (5,747) [1] (11,572) [1]
AFS Fair Value, 12 months or longer 46,097 32,905
AFS Unrealized Losses, 12 months or longer (3,719) [1] (3,863) [1]
HTM Fair Value, Less than 12 months 7,244 27,149
HTM Unrealized (Losses) Gains, Less than 12 months (94) [1] (1,346) [1]
HTM Unrecognized Gains (Losses), Less than 12 months 78 [2] 8 [2]
HTM Fair Value, 12 months or longer 15,029 36,626
HTM Unrealized Losses, 12 months or longer (2,975) [1] (7,035)
HTM Unrecognized Gains, 12 months or longer 1,822 [2] 2,251 [2]
Total AFS and HTM Fair Value, Less than 12 months 224,746 551,477
Total AFS and HTM Unrealized (Losses) Gains, Less than 12 months (5,841) [1] (12,918) [1]
Total AFS and HTM Fair Value, 12 months or longer 61,126 69,531
Total AFS and HTM Unrealized Losses, 12 months or longer (6,694) [1] (10,898)
Obligations of States and Political Subdivisions [Member]
    
HTM Fair Value, Less than 12 months 7,244 21,036
HTM Unrealized (Losses) Gains, Less than 12 months (94) [1] (381) [1]
HTM Unrecognized Gains (Losses), Less than 12 months 78 [2] 45 [2]
HTM Fair Value, 12 months or longer 9,419 27,855
HTM Unrealized Losses, 12 months or longer (519) [1] (1,969)
HTM Unrecognized Gains, 12 months or longer 324 [2] 670 [2]
Corporate Securities [Member]
    
HTM Fair Value, Less than 12 months   1,985
HTM Unrealized (Losses) Gains, Less than 12 months   (434) [1]
HTM Unrecognized Gains (Losses), Less than 12 months   420 [2]
HTM Fair Value, 12 months or longer   0
HTM Unrealized Losses, 12 months or longer   0
HTM Unrecognized Gains, 12 months or longer   0 [2]
Asset-backed Securities ("ABS") [Member]
    
HTM Fair Value, Less than 12 months 0 507
HTM Unrealized (Losses) Gains, Less than 12 months 0 [1] (546) [1]
HTM Unrecognized Gains (Losses), Less than 12 months 0 [2] (440) [2]
HTM Fair Value, 12 months or longer 2,816 2,931
HTM Unrealized Losses, 12 months or longer (1,009) [1] (1,095)
HTM Unrecognized Gains, 12 months or longer 737 [2] 747 [2]
Commercial Mortgage-backed Securities ("CMBS") [Member]
    
HTM Fair Value, Less than 12 months 0 3,621
HTM Unrealized (Losses) Gains, Less than 12 months 0 [1] 15 [1]
HTM Unrecognized Gains (Losses), Less than 12 months 0 [2] (17) [2]
HTM Fair Value, 12 months or longer 2,794 5,745
HTM Unrealized Losses, 12 months or longer (1,447) [1] (3,933)
HTM Unrecognized Gains, 12 months or longer 761 [2] 833 [2]
Residential Mortgage Backed Securities ("RMBS") [Member]
    
HTM Fair Value, Less than 12 months   0
HTM Unrealized (Losses) Gains, Less than 12 months   0 [1]
HTM Unrecognized Gains (Losses), Less than 12 months   0 [2]
HTM Fair Value, 12 months or longer   95
HTM Unrealized Losses, 12 months or longer   (38)
HTM Unrecognized Gains, 12 months or longer   1 [2]
AFS Fixed Maturity Securities [Member]
    
AFS Fair Value, Less than 12 months 216,759 524,328
AFS Unrealized Losses, Less than 12 months (5,659) [1] (11,572) [1]
AFS Fair Value, 12 months or longer 46,097 32,905
AFS Unrealized Losses, 12 months or longer (3,719) [1] (3,863) [1]
AFS Fixed Maturity Securities [Member] | U.S. Government and Government Agencies [Member]
    
AFS Fair Value, Less than 12 months   3,956 [3]
AFS Unrealized Losses, Less than 12 months   (147) [1],[3]
AFS Fair Value, 12 months or longer   0 [3]
AFS Unrealized Losses, 12 months or longer   0 [1],[3]
AFS Fixed Maturity Securities [Member] | Foreign Government [Member]
    
AFS Fair Value, Less than 12 months 8,299 10,776
AFS Unrealized Losses, Less than 12 months (556) [1] (349) [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer 0 [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
AFS Fair Value, Less than 12 months 517 40,410
AFS Unrealized Losses, Less than 12 months (1) [1] (650) [1]
AFS Fair Value, 12 months or longer 1,740 0
AFS Unrealized Losses, 12 months or longer (45) [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Corporate Securities [Member]
    
AFS Fair Value, Less than 12 months 157,510 362,502
AFS Unrealized Losses, Less than 12 months (4,415) [1] (8,784) [1]
AFS Fair Value, 12 months or longer 14,084 0
AFS Unrealized Losses, 12 months or longer (881) [1] 0 [1]
AFS Fixed Maturity Securities [Member] | Asset-backed Securities ("ABS") [Member]
    
AFS Fair Value, Less than 12 months 15,808 30,297
AFS Unrealized Losses, Less than 12 months (14) [1] (273) [1]
AFS Fair Value, 12 months or longer 702 880
AFS Unrealized Losses, 12 months or longer (32) [1] (66) [1]
AFS Fixed Maturity Securities [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member]
    
AFS Fair Value, Less than 12 months 4,822 5,453
AFS Unrealized Losses, Less than 12 months (48) [1] (271) [1]
AFS Fair Value, 12 months or longer 14,564 11,115
AFS Unrealized Losses, 12 months or longer (1,619) [1] (2,652) [1]
AFS Fixed Maturity Securities [Member] | Residential Mortgage Backed Securities ("RMBS") [Member]
    
AFS Fair Value, Less than 12 months 29,803 70,934
AFS Unrealized Losses, Less than 12 months (625) [1] (1,098) [1]
AFS Fair Value, 12 months or longer 15,007 20,910
AFS Unrealized Losses, 12 months or longer (1,142) [1] (1,145) [1]
Equity Securities [Member]
    
AFS Fair Value, Less than 12 months 743 0
AFS Unrealized Losses, Less than 12 months (88) [1] 0 [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer $ 0 [1] $ 0 [1]
[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.
[2] Unrecognized holding gains/(losses) represent fair value fluctuations from the later of: (i) the date a security is designated as HTM; or (ii) the date that an OTTI charge is recognized on an HTM security.
[3] U.S. government includes corporate securities fully guaranteed by the FDIC.