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Investments Schedule of Available-for-sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 743,455 $ 833,375
Available-for-sale Securities, Gross Unrealized Gains 12,050 11,709
Available-for-sale Securities, Gross Unrealized Losses (380) (588)
Available-for-sale securities at fair value 755,125 844,496
US Government and Government Agencies and Authorities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 2,789 4,603
Available-for-sale Securities, Gross Unrealized Gains 0 20
Available-for-sale Securities, Gross Unrealized Losses (11) (21)
Available-for-sale securities at fair value 2,778 4,602
US Government-sponsored Enterprises Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 227,204 378,055
Available-for-sale Securities, Gross Unrealized Gains 1,260 1,458
Available-for-sale Securities, Gross Unrealized Losses 0 (90)
Available-for-sale securities at fair value 228,464 379,423
Corporate Debt Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 4,990 4,953
Available-for-sale Securities, Gross Unrealized Gains 0 0
Available-for-sale Securities, Gross Unrealized Losses (34) (41)
Available-for-sale securities at fair value 4,956 4,912
Municipal Bonds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 198,712 196,961
Available-for-sale Securities, Gross Unrealized Gains 3,816 3,733
Available-for-sale Securities, Gross Unrealized Losses (36) (19)
Available-for-sale securities at fair value 202,492 200,675
Mortgage Backed Securities, Other [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 299,246 [1] 248,329 [1]
Available-for-sale Securities, Gross Unrealized Gains 6,868 [1] 6,403 [1]
Available-for-sale Securities, Gross Unrealized Losses (280) [1] (388) [1]
Available-for-sale securities at fair value 305,834 [1] 254,344 [1]
Other Aggregated Investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 10,514 474
Available-for-sale Securities, Gross Unrealized Gains 106 95
Available-for-sale Securities, Gross Unrealized Losses (19) (29)
Available-for-sale securities at fair value $ 10,601 $ 540
[1] All mortgage-backed securities are guaranteed by U.S. government agencies or Government-sponsored entities.