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Investments (Held-To-Maturity Securities Disclosure) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 334,875 $ 390,622
Net Unrealized Gains (Losses) 1,207 2,257
Carrying Value 336,082 392,879
Unrecognized Holding Gains 18,109 24,102
Unrecognized Holding Losses (1) 0
HTM, Fair Value 354,190 416,981
Held To Maturity securities average duration 2 years 0 months 0 days  
Foreign Government [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 5,292 5,292
Net Unrealized Gains (Losses) 68 131
Carrying Value 5,360 5,423
Unrecognized Holding Gains 47 168
Unrecognized Holding Losses 0 0
HTM, Fair Value 5,407 5,591
Obligations of States and Political Subdivisions [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 301,216 348,109
Net Unrealized Gains (Losses) 2,472 4,013
Carrying Value 303,688 352,122
Unrecognized Holding Gains 13,921 17,634
Unrecognized Holding Losses 0 0
HTM, Fair Value 317,609 369,756
Corporate Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 20,303 28,174
Net Unrealized Gains (Losses) (325) (346)
Carrying Value 19,978 27,828
Unrecognized Holding Gains 2,749 2,446
Unrecognized Holding Losses (1) 0
HTM, Fair Value 22,726 30,274
Asset-Backed Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 3,111 3,413
Net Unrealized Gains (Losses) (530) (655)
Carrying Value 2,581 2,758
Unrecognized Holding Gains 543 657
Unrecognized Holding Losses 0 0
HTM, Fair Value 3,124 3,415
Commercial Mortgage Backed Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 4,953 5,634
Net Unrealized Gains (Losses) (478) (886)
Carrying Value 4,475 4,748
Unrecognized Holding Gains 849 3,197
Unrecognized Holding Losses 0 0
HTM, Fair Value $ 5,324 $ 7,945