Investments (Held-To-Maturity Securities Disclosure) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 229,455	$ 317,179
Net Unrealized Gains (Losses)	414	958
Carrying Value	229,869	318,137
Unrecognized Holding Gains	10,519	15,824
Unrecognized Holding Losses	0	0
HTM, Fair Value	$ 240,388	333,961
Held-to-maturity Securities Average Duration	1 year 6 months
Foreign Government [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		5,292
Net Unrealized Gains (Losses)		47
Carrying Value		5,339
Unrecognized Holding Gains		55
Unrecognized Holding Losses		0
HTM, Fair Value		5,394
Obligations of States and Political Subdivisions [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 205,443	285,301
Net Unrealized Gains (Losses)	1,108	2,071
Carrying Value	206,551	287,372
Unrecognized Holding Gains	7,423	11,760
Unrecognized Holding Losses	0	0
HTM, Fair Value	213,974	299,132
Corporate Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	18,147	18,899
Net Unrealized Gains (Losses)	(241)	(273)
Carrying Value	17,906	18,626
Unrecognized Holding Gains	2,467	2,796
Unrecognized Holding Losses	0	0
HTM, Fair Value	20,373	21,422
Asset-Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,209	2,818
Net Unrealized Gains (Losses)	(157)	(455)
Carrying Value	1,052	2,363
Unrecognized Holding Gains	158	460
Unrecognized Holding Losses	0	0
HTM, Fair Value	1,210	2,823
Commercial Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,656	4,869
Net Unrealized Gains (Losses)	(296)	(432)
Carrying Value	4,360	4,437
Unrecognized Holding Gains	471	753
Unrecognized Holding Losses	0	0
HTM, Fair Value	$ 4,831	$ 5,190