Investments (Narrative) (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) security $ / shares	Dec. 31, 2017 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Restricted stock	$ 624	$ 456
Number of temporarily impaired securities | security	177	127
Fair value of temporarily impaired securities	$ 96,018	$ 69,788
Unrealized Losses	$ 1,882	1,046
Equity securities held | security	1
Securities pledged as collateral	$ 72,400	$ 84,100
Equity Securities, FV NI	$ 403
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