Investments (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Gain (Loss) on Investments [Line Items]
Securities held-to-maturity with unrealized losses	$ 0	$ 0
Other-than-temporary impairments, available-for-sale securities	0	0
Single Largest Loss Position	340,000	252,000
Second Largest Loss Position	85,000	211,000
Third Largest Loss Position	$ 66,000	$ 186,000
Maximum [Member]
Gain (Loss) on Investments [Line Items]
Percent of investment portfolio below investment grade	5.98%