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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
Mar. 31, 2014
Dec. 31, 2013
AFS Fair Value, Less than 12 months $ 1,171,643 $ 1,411,803
AFS Unrealized Losses, Less than 12 month (28,732) [1] (49,106) [1]
AFS Fair Value, 12 months or longer 53,076 40,731
AFS Unrealized Losses, 12 months or longer (2,633) [1] (2,865) [1]
HTM Fair Value, Less than 12 months 0 65
HTM Unrealized Losses, Less than 12 months 0 [1] (5) [1]
HTM Unrecognized Gains, Less than 12 months 0 [2] 5 [2]
HTM Fair Value, 12 months or longer 2,940 2,931
HTM Unrealized Losses, 12 months or longer (640) [1] (675) [1]
HTM Unrecognized Gains, 12 months or longer 610 [2] 635 [2]
Total AFS and HTM Fair Value, Less than 12 months 1,171,643 1,411,868
Total AFS and HTM Unrealized Losses, Less than 12 months (28,732) [1] (49,111) [1]
Total AFS and HTM Fair Value, 12 months or longer 56,016 43,662
Total AFS and HTM Unrealized Losses, 12 months or longer (3,273) [1] (3,540) [1]
Obligations of States and Political Subdivisions [Member]
    
HTM Fair Value, Less than 12 months 0 65
HTM Unrealized Losses, Less than 12 months 0 [1] (5) [1]
HTM Unrecognized Gains, Less than 12 months 0 [2] 5 [2]
HTM Fair Value, 12 months or longer 445 441
HTM Unrealized Losses, 12 months or longer (19) [1] (20) [1]
HTM Unrecognized Gains, 12 months or longer 18 [2] 14 [2]
Asset-backed Securities [Member]
    
HTM Fair Value, Less than 12 months 0 0
HTM Unrealized Losses, Less than 12 months 0 [1] 0 [1]
HTM Unrecognized Gains, Less than 12 months 0 [2] 0 [2]
HTM Fair Value, 12 months or longer 2,495 2,490
HTM Unrealized Losses, 12 months or longer (621) [1] (655) [1]
HTM Unrecognized Gains, 12 months or longer 592 [2] 621 [2]
AFS Fixed Income Securities [Member]
    
AFS Fair Value, Less than 12 months 1,169,705 1,410,679
AFS Unrealized Losses, Less than 12 month (28,615) [1] (49,010) [1]
AFS Fair Value, 12 months or longer 53,076 40,731
AFS Unrealized Losses, 12 months or longer (2,633) [1] (2,865) [1]
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
    
AFS Fair Value, Less than 12 months 13,119 16,955
AFS Unrealized Losses, Less than 12 month (370) [1] (500) [1]
AFS Fair Value, 12 months or longer 0 507
AFS Unrealized Losses, 12 months or longer 0 [1] (4) [1]
AFS Fixed Income Securities [Member] | Foreign Government [Member]
    
AFS Fair Value, Less than 12 months 1,753 2,029
AFS Unrealized Losses, Less than 12 month (9) [1] (30) [1]
AFS Fair Value, 12 months or longer 2,978 2,955
AFS Unrealized Losses, 12 months or longer (20) [1] (42) [1]
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
AFS Fair Value, Less than 12 months 373,064 442,531
AFS Unrealized Losses, Less than 12 month (9,984) [1] (19,120) [1]
AFS Fair Value, 12 months or longer 20,096 13,530
AFS Unrealized Losses, 12 months or longer (703) [1] (905) [1]
AFS Fixed Income Securities [Member] | Corporate Securities [Member]
    
AFS Fair Value, Less than 12 months 464,163 511,100
AFS Unrealized Losses, Less than 12 month (8,636) [1] (15,911) [1]
AFS Fair Value, 12 months or longer 17,713 14,771
AFS Unrealized Losses, 12 months or longer (1,157) [1] (1,138) [1]
AFS Fixed Income Securities [Member] | Asset-backed Securities [Member]
    
AFS Fair Value, Less than 12 months 23,855 68,725
AFS Unrealized Losses, Less than 12 month (360) [1] (468) [1]
AFS Fair Value, 12 months or longer 0 0
AFS Unrealized Losses, 12 months or longer 0 [1] 0 [1]
AFS Fixed Income Securities [Member] | Commercial Mortgage-backed Securities (CMBS) [Member]
    
AFS Fair Value, Less than 12 months 72,437 100,396
AFS Unrealized Losses, Less than 12 month (1,962) [1] (2,950) [1]
AFS Fair Value, 12 months or longer 7,466 6,298
AFS Unrealized Losses, 12 months or longer (294) [1] (516) [1]
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities (RMBS) [Member]
    
AFS Fair Value, Less than 12 months 221,314 268,943
AFS Unrealized Losses, Less than 12 month (7,294) [1] (10,031) [1]
AFS Fair Value, 12 months or longer 4,823 2,670
AFS Unrealized Losses, 12 months or longer (459) [1] (260) [1]
Equity Securities [Member]
    
AFS Fair Value, Less than 12 months 1,938 1,124
AFS Unrealized Losses, Less than 12 month (117) [1] (96) [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 gains 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.