Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)				3 Months Ended		9 Months Ended
	Apr. 30, 2018	Nov. 30, 2015	Sep. 08, 2006	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Goodwill included in acquisition price				$ 9,139,000		$ 9,139,000		$ 5,448,000
Amortization of intangible assets				23,000	$ 17,000	54,000	$ 52,000
Goodwill impairment loss				0	$ 0	0	$ 0
Branch Office in Richfield, PA [Member]
Acquisition date			Sep. 08, 2006
Goodwill included in acquisition price				2,046,000		2,046,000		2,046,000
FNBPA Bancorp, Inc [Member]
Acquisition date		Nov. 30, 2015
Goodwill included in acquisition price				3,402,000		$ 3,402,000		$ 3,402,000
Intangible assets included in purchase price		$ 303,000
Intangible assets amortization period						10 years
Amortization of intangible assets				11,000		$ 33,000
Liverpool Community Bank [Member]
Acquisition date	Apr. 30, 2018
Goodwill included in acquisition price	$ 3,691,000
Intangible assets included in purchase price	289,000
Intangible assets amortization period						10 years
Amortization of intangible assets				$ 13,000		$ 22,000
Core deposit and other intangibles	$ 289,000
Other Intangible Assets [Member] | FNBPA Bancorp, Inc [Member]
Intangible assets included in purchase price		$ 40,000
Intangible assets amortization period						2 years