Investments (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) security $ / shares	Dec. 31, 2017 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Restricted stock	$ 456	$ 456
Number of temporarily impaired securities | security	166	127
Fair value of temporarily impaired securities	$ 92,141	$ 69,788
Unrealized Losses	$ 1,706	1,046
Equity securities held | security	1
Securities pledged as collateral	$ 78,900	$ 84,100
Equity Securities, FV NI	$ 410
Federal Home Loan Bank of Pittsburgh [Member]
Schedule of Available-for-sale Securities [Line Items]
Restricted stock per share | $ / shares	$ 100
Non-Federal Home Loan Bank Of Pittsburgh [Member]
Schedule of Available-for-sale Securities [Line Items]
Restricted stock	$ 30