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Investments (Securities Available for Sale) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Debt securities $ 2,614,493 $ 2,524,118
Gross Unrealized Gains, Debt securities 175,438 144,950
Gross Unrealized Losses, Debt securities (6,982) (32,402)
Fair Value, Debt securities 2,782,949 2,636,666
Amortized Cost, Equity securities   11,146
Gross Unrealized Gains, Equity securities   4,489
Gross Unrealized Losses, Equity securities   (757)
Fair Value, Equity securities   14,878
Amortized Cost 2,625,676 2,535,264
Gross Unrealized Gains 181,022 149,439
Gross Unrealized Losses (7,248) (33,159)
Securities available for sale, at fair value (cost: $2,625,676 and $2,535,264) 2,799,450 2,651,544
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 35,763 570,715
Less than 12 Months, Unrealized Losses (262) (28,639)
12 Months or Greater, Fair Value 284,699 47,633
12 Months or Greater, Unrealized Losses (6,986) (4,520)
Total, Fair Value 320,462 618,348
Total, Unrealized Losses (7,248) (33,159)
Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, at fair value (cost: $2,625,676 and $2,535,264) 2,782,949 2,636,666
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 35,561 567,008
Less than 12 Months, Unrealized Losses (251) (27,882)
12 Months or Greater, Fair Value 280,921 47,633
12 Months or Greater, Unrealized Losses (6,731) (4,520)
Total, Fair Value 316,482 614,641
Total, Unrealized Losses (6,982) (32,402)
States and Political Subdivisions [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Debt securities 592 594
Gross Unrealized Gains, Debt securities 0 0
Gross Unrealized Losses, Debt securities (40) (110)
Fair Value, Debt securities 552 484
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or Greater, Fair Value 552 484
12 Months or Greater, Unrealized Losses (40) (110)
Total, Fair Value 552 484
Total, Unrealized Losses (40) (110)
Foreign Governments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Debt securities 9,935 9,931
Gross Unrealized Gains, Debt securities 370 0
Gross Unrealized Losses, Debt securities 0 (156)
Fair Value, Debt securities 10,305 9,775
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value   9,775
Less than 12 Months, Unrealized Losses   (156)
12 Months or Greater, Fair Value   0
12 Months or Greater, Unrealized Losses   0
Total, Fair Value   9,775
Total, Unrealized Losses   (156)
Public Utilities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Debt securities 230,681 233,788
Gross Unrealized Gains, Debt securities 14,459 15,014
Gross Unrealized Losses, Debt securities (456) (1,397)
Fair Value, Debt securities 244,684 247,405
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 0 20,090
Less than 12 Months, Unrealized Losses 0 (1,343)
12 Months or Greater, Fair Value 18,505 962
12 Months or Greater, Unrealized Losses (456) (54)
Total, Fair Value 18,505 21,052
Total, Unrealized Losses (456) (1,397)
Corporate [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Debt securities 2,302,436 2,195,124
Gross Unrealized Gains, Debt securities 155,856 124,519
Gross Unrealized Losses, Debt securities (6,476) (30,732)
Fair Value, Debt securities 2,451,816 2,288,911
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 35,561 532,310
Less than 12 Months, Unrealized Losses (251) (26,376)
12 Months or Greater, Fair Value 257,039 46,187
12 Months or Greater, Unrealized Losses (6,225) (4,356)
Total, Fair Value 292,600 578,497
Total, Unrealized Losses (6,476) (30,732)
Mortgage-backed [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Debt securities 55,750 68,799
Gross Unrealized Gains, Debt securities 4,400 5,040
Gross Unrealized Losses, Debt securities 0 0
Fair Value, Debt securities 60,150 73,839
Home Equity [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Debt securities 11,906 12,079
Gross Unrealized Gains, Debt securities 253 245
Gross Unrealized Losses, Debt securities (10) (7)
Fair Value, Debt securities 12,149 12,317
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 0 4,833
Less than 12 Months, Unrealized Losses 0 (7)
12 Months or Greater, Fair Value 4,825 0
12 Months or Greater, Unrealized Losses (10) 0
Total, Fair Value 4,825 4,833
Total, Unrealized Losses (10) (7)
Manufactured Housing [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Debt securities 3,193 3,803
Gross Unrealized Gains, Debt securities 100 132
Gross Unrealized Losses, Debt securities 0 0
Fair Value, Debt securities 3,293 3,935
Equity Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, at fair value (cost: $2,625,676 and $2,535,264) 16,501 14,878
Equity Public [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Equity securities 11,183  
Gross Unrealized Gains, Equity securities 5,584  
Gross Unrealized Losses, Equity securities (266)  
Fair Value, Equity securities 16,501  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than 12 Months, Fair Value 202 3,707
Less than 12 Months, Unrealized Losses (11) (757)
12 Months or Greater, Fair Value 3,778 0
12 Months or Greater, Unrealized Losses (255) 0
Total, Fair Value 3,980 3,707
Total, Unrealized Losses $ (266) $ (757)