Investments (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) security	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) security	Jun. 30, 2015 USD ($)	Dec. 31, 2015 security
Investments [Abstract]
Gross gains on investments	$ 600	$ 5,000	$ 700	$ 5,900
Gross losses on investments	200	25	200	53
Proceeds from sale of investment securities	$ 11,000	15,200	$ 15,900	16,800
Number of debt security positions, greater than 12 months | security	32		32		39
Other-than-temporary impairments	$ 2,587	$ 1,553	$ 2,888	$ 1,830