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Investments (Held-To-Maturity Securities Disclosure) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 247,346 $ 317,179
Net Unrealized Gains (Losses) 513 958
Carrying Value 247,859 318,137
Unrecognized Holding Gains 11,846 15,824
Unrecognized Holding Losses (3) 0
HTM, Fair Value $ 259,702 333,961
Held To Maturity securities average duration 1 year 7 months 8 days  
Foreign Government [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 5,292 5,292
Net Unrealized Gains (Losses) 3 47
Carrying Value 5,295 5,339
Unrecognized Holding Gains 0 55
Unrecognized Holding Losses (3) 0
HTM, Fair Value 5,292 5,394
Obligations of States and Political Subdivisions [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 216,870 285,301
Net Unrealized Gains (Losses) 1,395 2,071
Carrying Value 218,265 287,372
Unrecognized Holding Gains 8,441 11,760
Unrecognized Holding Losses 0 0
HTM, Fair Value 226,706 299,132
Corporate Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 18,532 18,899
Net Unrealized Gains (Losses) (265) (273)
Carrying Value 18,267 18,626
Unrecognized Holding Gains 2,565 2,796
Unrecognized Holding Losses 0 0
HTM, Fair Value 20,832 21,422
Asset-Backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,976 2,818
Net Unrealized Gains (Losses) (280) (455)
Carrying Value 1,696 2,363
Unrecognized Holding Gains 285 460
Unrecognized Holding Losses 0 0
HTM, Fair Value 1,981 2,823
Commercial Mortgage Backed Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 4,676 4,869
Net Unrealized Gains (Losses) (340) (432)
Carrying Value 4,336 4,437
Unrecognized Holding Gains 555 753
Unrecognized Holding Losses 0 0
HTM, Fair Value $ 4,891 $ 5,190