Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Beginning balance			$ (24,403)
Balance	$ 126,155	$ 122,399	117,066	$ 108,390
Ending balance	(20,493)			(24,403)
Balance	129,339	126,155	122,399	117,066
Investment securities- with OTTI AFS [Member]
Balance	(2,173)	(1,979)	(1,899)	(2,939)
Other comprehensive income/(loss) before reclassifications	(820)	(157)	(44)	1,194
Amounts reclassified from accumulated other comprehensive loss	(37)	(37)	(36)	(154)
Balance	(3,030)	(2,173)	(1,979)	(1,899)
Investment Securities -All Other AFS [Member]
Balance	(1,119)	(2,696)	(3,601)	(2,979)
Other comprehensive income/(loss) before reclassifications	403	1,581	901	(540)
Amounts reclassified from accumulated other comprehensive loss	(1)	(4)	4	(82)
Balance	(717)	(1,119)	(2,696)	(3,601)
Investment Securities HTM [Member]
Balance	(1,013)	(1,076)	(1,131)	(1,347)
Amounts reclassified from accumulated other comprehensive loss	60	63	55	216
Balance	(953)	(1,013)	(1,076)	(1,131)
Cash Flow Hedge [Member]
Balance	(28)	458	773	582
Other comprehensive income/(loss) before reclassifications	(239)	(486)	(315)	191
Balance	(267)	(28)	458	773
Pension Plan [Member]
Balance	(15,181)	(15,888)	(18,017)	(17,066)
Other comprehensive income/(loss) before reclassifications	(75)	511	1,933	(1,833)
Amounts reclassified from accumulated other comprehensive loss	196	196	196	882
Balance	(15,060)	(15,181)	(15,888)	(18,017)
SERP [Member]
Balance	(486)	(507)	(528)	(844)
Other comprehensive income/(loss) before reclassifications				202
Amounts reclassified from accumulated other comprehensive loss	20	21	21	114
Balance	(466)	(486)	(507)	(528)
Accumulated Other Comprehensive Loss [Member]
Balance	(20,000)	(21,688)	(24,403)	(24,593)
Other comprehensive income/(loss) before reclassifications	(731)	1,449	2,475	(786)
Amounts reclassified from accumulated other comprehensive loss	238	239	240	976
Balance	$ (20,493)	$ (20,000)	$ (21,688)	$ (24,403)