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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
Sep. 30, 2014
Dec. 31, 2013
AFS Fair Value, Less than 12 months $ 532,683 $ 1,411,803
AFS Unrealized Losses, Less than 12 months (6,101) [1] (49,106) [1]
AFS Fair Value, 12 months or longer 505,310 40,731
AFS Unrealized Losses, 12 months or longer (13,141) [1] (2,865) [1]
HTM Fair Value, Less than 12 months 460 65
HTM Unrealized Losses, Less than 12 months (9) [1] (5) [1]
HTM Unrecognized Gains, Less than 12 months 8 [2] 5 [2]
HTM Fair Value, 12 months or longer 2,428 2,931
HTM Unrealized Losses, 12 months or longer (530) [1] (675) [1]
HTM Unrecognized Gains, 12 months or longer 516 [2] 635 [2]
Total AFS and HTM Fair Value, Less than 12 months 533,143 1,411,868
Total AFS and HTM Unrealized Losses, Less than 12 months (6,110) [1] (49,111) [1]
Total AFS and HTM Securities Unrecognized Gains, Less Than 12 Months 8 [2] 5 [2]
Total AFS and HTM Fair Value, 12 months or longer 507,738 43,662
Total AFS and HTM Unrealized Losses, 12 months or longer (13,671) [1] (3,540) [1]
Total AFS and HTM Securities Unrecognized Gains, 12 months or longer 516 [2] 635 [2]
Obligations of States and Political Subdivisions [Member]
    
HTM Fair Value, Less than 12 months 460 65
HTM Unrealized Losses, Less than 12 months (9) [1] (5) [1]
HTM Unrecognized Gains, Less than 12 months 8 [2] 5 [2]
HTM Fair Value, 12 months or longer 0 441
HTM Unrealized Losses, 12 months or longer 0 [1] (20) [1]
HTM Unrecognized Gains, 12 months or longer 0 [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 2,428 2,490
HTM Unrealized Losses, 12 months or longer (530) [1] (655) [1]
HTM Unrecognized Gains, 12 months or longer 516 [2] 621 [2]
AFS Fixed Income Securities [Member]
    
AFS Fair Value, Less than 12 months 497,454 1,410,679
AFS Unrealized Losses, Less than 12 months (2,151) [1] (49,010) [1]
AFS Fair Value, 12 months or longer 505,310 40,731
AFS Unrealized Losses, 12 months or longer (13,141) [1] (2,865) [1]
AFS Fixed Income Securities [Member] | U.S. Government and Government Agencies [Member]
    
AFS Fair Value, Less than 12 months 1,001 16,955
AFS Unrealized Losses, Less than 12 months 0 [1] (500) [1]
AFS Fair Value, 12 months or longer 13,219 507
AFS Unrealized Losses, 12 months or longer (263) [1] (4) [1]
AFS Fixed Income Securities [Member] | Foreign Government [Member]
    
AFS Fair Value, Less than 12 months 4,755 2,029
AFS Unrealized Losses, Less than 12 months (6) [1] (30) [1]
AFS Fair Value, 12 months or longer 0 2,955
AFS Unrealized Losses, 12 months or longer 0 [1] (42) [1]
AFS Fixed Income Securities [Member] | Obligations of States and Political Subdivisions [Member]
    
AFS Fair Value, Less than 12 months 121,728 442,531
AFS Unrealized Losses, Less than 12 months (292) [1] (19,120) [1]
AFS Fair Value, 12 months or longer 98,944 13,530
AFS Unrealized Losses, 12 months or longer (1,485) [1] (905) [1]
AFS Fixed Income Securities [Member] | Corporate Debt Securities [Member]
    
AFS Fair Value, Less than 12 months 274,501 511,100
AFS Unrealized Losses, Less than 12 months (1,529) [1] (15,911) [1]
AFS Fair Value, 12 months or longer 158,127 14,771
AFS Unrealized Losses, 12 months or longer (5,102) [1] (1,138) [1]
AFS Fixed Income Securities [Member] | Asset-Backed Securities [Member]
    
AFS Fair Value, Less than 12 months 47,542 68,725
AFS Unrealized Losses, Less than 12 months (134) [1] (468) [1]
AFS Fair Value, 12 months or longer 14,149 0
AFS Unrealized Losses, 12 months or longer (248) [1] 0 [1]
AFS Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member]
    
AFS Fair Value, Less than 12 months 16,969 100,396
AFS Unrealized Losses, Less than 12 months (89) [1] (2,950) [1]
AFS Fair Value, 12 months or longer 57,634 6,298
AFS Unrealized Losses, 12 months or longer (1,404) [1] (516) [1]
AFS Fixed Income Securities [Member] | Residential Mortgage Backed Securities [Member]
    
AFS Fair Value, Less than 12 months 30,958 268,943
AFS Unrealized Losses, Less than 12 months (101) [1] (10,031) [1]
AFS Fair Value, 12 months or longer 163,237 2,670
AFS Unrealized Losses, 12 months or longer (4,639) [1] (260) [1]
Equity Securities [Member]
    
AFS Fair Value, Less than 12 months 35,229 1,124
AFS Unrealized Losses, Less than 12 months (3,950) [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.