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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
Jun. 30, 2011
securities
years
Dec. 31, 2010
securities
years
Amortized Cost $ 1,059,314,000 $ 1,199,801,000
Net Unrealized Gains (Losses) 11,264,000 14,523,000
Carrying Value 1,070,578,000 1,214,324,000
Unrecognized Holding Gains 51,896,000 43,998,000
Unrecognized Holding Losses (1,497,000) (2,028,000)
Fair Value 1,120,977,000 1,256,294,000
Held To Maturity securities average duration 3.2 3.4
U.S. Government and Government Agencies [Member]
    
Amortized Cost 86,479,000 93,411,000
Net Unrealized Gains (Losses) 4,280,000 4,695,000
Carrying Value 90,759,000 98,106,000
Unrecognized Holding Gains 6,336,000 5,023,000
Unrecognized Holding Losses 0 0
Fair Value 97,095,000 103,129,000
Foreign Government [Member]
    
Amortized Cost 5,292,000 5,292,000
Net Unrealized Gains (Losses) 330,000 368,000
Carrying Value 5,622,000 5,660,000
Unrecognized Holding Gains 0 0
Unrecognized Holding Losses (167,000) (30,000)
Fair Value 5,455,000 5,630,000
Obligations of States and Political Subdivisions [Member]
    
Amortized Cost 779,013,000 874,388,000
Net Unrealized Gains (Losses) 17,284,000 22,183,000
Carrying Value 796,297,000 896,571,000
Unrecognized Holding Gains 25,828,000 16,845,000
Unrecognized Holding Losses (594,000) (1,132,000)
Fair Value 821,531,000 912,284,000
Corporate Securities [Member]
    
Amortized Cost 72,739,000 76,663,000
Net Unrealized Gains (Losses) (3,023,000) (3,990,000)
Carrying Value 69,716,000 72,673,000
Unrecognized Holding Gains 8,027,000 9,705,000
Unrecognized Holding Losses (8,000) (313,000)
Fair Value 77,735,000 82,065,000
Asset-backed Securities ("ABS") [Member]
    
Amortized Cost 10,238,000 12,947,000
Net Unrealized Gains (Losses) (2,255,000) (2,422,000)
Carrying Value 7,983,000 10,525,000
Unrecognized Holding Gains 1,803,000 1,847,000
Unrecognized Holding Losses (510,000) (444,000)
Fair Value 9,276,000 11,928,000
Commercial Mortgage-backed Securities ("CMBS") [Member]
    
Amortized Cost 42,784,000 54,909,000
Net Unrealized Gains (Losses) (6,181,000) (7,354,000)
Carrying Value 36,603,000 [1] 47,555,000 [1]
Unrecognized Holding Gains 7,470,000 7,483,000
Unrecognized Holding Losses (218,000) (109,000)
Fair Value 43,855,000 54,929,000
Government Guaranteed Agency Securities Carrying Value 5,000,000 8,900,000
Residential Mortgage Backed Securities ("RMBS") [Member]
    
Amortized Cost 62,769,000 82,191,000
Net Unrealized Gains (Losses) 829,000 1,043,000
Carrying Value 63,598,000 [2] 83,234,000 [2]
Unrecognized Holding Gains 2,432,000 3,095,000
Unrecognized Holding Losses 0 0
Fair Value 66,030,000 86,329,000
Government Guaranteed Agency Securities Carrying Value $ 6,900,000 $ 4,000,000
[1] 1 CMBS includes government guaranteed agency securities with a carrying value of $5.0 million at June 30, 2011 and $8.9 million at December 31, 2010.
[2] 2 RMBS includes government guaranteed agency securities with a carrying value of $6.9 million at June 30, 2011 and $4.0 million at December 31, 2010.