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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
security
Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 662,324,000 $ 706,782,000
Net Unrealized Gains (Losses) 4,868,000 5,566,000
Carrying Value 667,192,000 712,348,000
Unrecognized Holding Gains 44,677,000 45,946,000
Unrecognized Holding Losses (138,000) (251,000)
Fair Value 711,731,000 758,043,000
Held To Maturity securities average duration 2.9  
Number of held to maturity securities transferred to available-for-sale 2  
Securities reclassified from the HTM category to AFS carrying value 4,400,000  
Securities reclassified from the HTM category to AFS net unrecognized gain 100,000  
Foreign Government [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 5,292,000 5,292,000
Net Unrealized Gains (Losses) 272,000 292,000
Carrying Value 5,564,000 5,584,000
Unrecognized Holding Gains 0 0
Unrecognized Holding Losses (109,000) (88,000)
Fair Value 5,455,000 5,496,000
Obligations of States and Political Subdivisions [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 570,970,000 614,118,000
Net Unrealized Gains (Losses) 10,526,000 11,894,000
Carrying Value 581,496,000 626,012,000
Unrecognized Holding Gains 30,826,000 31,529,000
Unrecognized Holding Losses (29,000) (156,000)
Fair Value 612,293,000 657,385,000
Corporate Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 64,686,000 64,840,000
Net Unrealized Gains (Losses) (1,873,000) (2,189,000)
Carrying Value 62,813,000 62,651,000
Unrecognized Holding Gains 6,250,000 6,887,000
Unrecognized Holding Losses 0 0
Fair Value 69,063,000 69,538,000
Asset-backed Securities ("ABS") [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 7,856,000 8,077,000
Net Unrealized Gains (Losses) (1,372,000) (1,469,000)
Carrying Value 6,484,000 6,608,000
Unrecognized Holding Gains 1,379,000 1,353,000
Unrecognized Holding Losses 0 (7,000)
Fair Value 7,863,000 7,954,000
Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 13,520,000 14,455,000
Net Unrealized Gains (Losses) (2,685,000) (2,962,000)
Carrying Value 10,835,000 11,493,000
Unrecognized Holding Gains 6,222,000 6,177,000
Unrecognized Holding Losses 0 0
Fair Value $ 17,057,000 $ 17,670,000