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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
years
Securities
Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 637,855,000 $ 706,782,000
Net Unrealized Gains (Losses) 5,646,000 5,566,000
Carrying Value 643,501,000 712,348,000
Unrecognized Holding Gains 44,589,000 45,946,000
Unrecognized Holding Losses (109,000) (251,000)
Fair Value 687,981,000 758,043,000
Held To Maturity securities average duration 2.8  
Number of held to maturity securities transferred to available-for-sale 5  
Securities reclassified from the HTM category to AFS carrying value 7,900,000  
Securities reclassified from the HTM category to AFS net unrecognized gain 1,000,000  
Foreign Government [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 5,292,000 5,292,000
Net Unrealized Gains (Losses) 252,000 292,000
Carrying Value 5,544,000 5,584,000
Unrecognized Holding Gains 0 0
Unrecognized Holding Losses (105,000) (88,000)
Fair Value 5,439,000 5,496,000
Obligations of States and Political Subdivisions [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 557,338,000 614,118,000
Net Unrealized Gains (Losses) 9,310,000 11,894,000
Carrying Value 566,648,000 626,012,000
Unrecognized Holding Gains 32,642,000 31,529,000
Unrecognized Holding Losses (4,000) (156,000)
Fair Value 599,286,000 657,385,000
Corporate Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 57,947,000 64,840,000
Net Unrealized Gains (Losses) (1,299,000) (2,189,000)
Carrying Value 56,648,000 62,651,000
Unrecognized Holding Gains 5,329,000 6,887,000
Unrecognized Holding Losses 0 0
Fair Value 61,977,000 69,538,000
Asset-backed Securities ("ABS") [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 7,579,000 8,077,000
Net Unrealized Gains (Losses) (1,265,000) (1,469,000)
Carrying Value 6,314,000 6,608,000
Unrecognized Holding Gains 1,223,000 1,353,000
Unrecognized Holding Losses 0 (7,000)
Fair Value 7,537,000 7,954,000
Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 9,699,000 14,455,000
Net Unrealized Gains (Losses) (1,352,000) (2,962,000)
Carrying Value 8,347,000 11,493,000
Unrecognized Holding Gains 5,395,000 6,177,000
Unrecognized Holding Losses 0 0
Fair Value $ 13,742,000 $ 17,670,000