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Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2017
Beginning balance			$ (24,593)
Balance	$ 112,974	$ 111,134	108,390	$ 120,838	$ 113,698
Ending balance	(24,038)			(24,593)	(24,593)
Balance	115,581	112,974	111,134	108,390	108,390
Investment securities- with OTTI [Member]
Balance	(1,349)	(2,294)	(2,939)		(2,368)
Other comprehensive income/(loss) before reclassifications	300	1,089	685		31
Reclassification of certain tax effect					(481)
Amounts reclassified from accumulated other comprehensive income (loss)	(39)	(144)	(40)		(121)
Balance	(1,088)	(1,349)	(2,294)	(2,939)	(2,939)
Investment Securities -All Other AFS [Member]
Balance	(4,287)	(4,057)	(2,979)		(3,218)
Other comprehensive income/(loss) before reclassifications	(672)	(237)	(1,085)		638
Reclassification of certain tax effect					(435)
Amounts reclassified from accumulated other comprehensive income (loss)	7	7	7		36
Balance	(4,952)	(4,287)	(4,057)	(2,979)	(2,979)
Investment Securities HTM [Member]
Balance	(1,264)	(1,302)	(1,347)		(1,354)
Other comprehensive income/(loss) before reclassifications	0	0	0		0
Reclassification of certain tax effect					(246)
Amounts reclassified from accumulated other comprehensive income (loss)	63	38	45		253
Balance	(1,201)	(1,264)	(1,302)	(1,347)	(1,347)
Cash Flow Hedge (OCI) [Member]
Balance	1,133	1,025	582		422
Other comprehensive income/(loss) before reclassifications	112	108	443		59
Reclassification of certain tax effect					101
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0		0
Balance	1,245	1,133	1,025	582	582
Pension Plan [Member]
Balance	(17,860)	(16,330)	(17,066)		(14,232)
Other comprehensive income/(loss) before reclassifications	355	(1,750)	516		(445)
Reclassification of certain tax effect					(3,170)
Amounts reclassified from accumulated other comprehensive income (loss)	220	220	220		781
Balance	(17,285)	(17,860)	(16,330)	(17,066)	(17,066)
SERP [Member]
Balance	(786)	(815)	(844)		(715)
Other comprehensive income/(loss) before reclassifications	0	0	0		(82)
Reclassification of certain tax effect					(152)
Amounts reclassified from accumulated other comprehensive income (loss)	29	29	29		105
Balance	(757)	(786)	(815)	(844)	(844)
Accumulated Other Comprehensive Loss [Member]
Balance	(24,413)	(23,773)	(24,593)	(18,965)	(21,465)
Other comprehensive income/(loss) before reclassifications	95	(790)	559		201
Reclassification of certain tax effect				(4,383)	(4,383)
Amounts reclassified from accumulated other comprehensive income (loss)	280	150	261		1,054
Balance	$ (24,038)	$ (24,413)	$ (23,773)	$ (24,593)	$ (24,593)

X

- Definition

Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax liability and asset pursuant to Tax Cuts and Jobs Act of 2017.

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-Publisher FASB
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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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