Investments (Narrative) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) item $ / shares	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Average life of the equity portfolio	3 years 6 months
Percent of shareholders equity benchmark for investments in a single issuer	10.00%
Restricted stock	$ 456		$ 1,767
Number of investments in a single issuer exceeding benchmark | item	0
Securities pledged as collateral	$ 84,100		79,100
Gain on conversion of investment security		$ 728
Available for sale	127,336		$ 143,875
Federal Home Loan Bank of Pittsburgh [Member]
Schedule of Available-for-sale Securities [Line Items]
Restricted stock	$ 426
Restricted stock per share | $ / shares	$ 100