Investments (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) security	Mar. 31, 2015 USD ($)	Dec. 31, 2015 security
Investments [Abstract]
Gross gains on investments	$ 100	$ 900
Gross losses on investments	23	28
Proceeds from sale of investment securities	$ 4,800	$ 1,600
Number of debt security positions, greater than 12 months | security	33		39