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Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Beginning balance	$ (24,593)
Balance	108,390	$ 113,698
Reclassification of certain tax effect		0
Ending balance	(23,773)	(24,593)
Balance	111,134	108,390
Investment securities- with OTTI [Member]
Balance	(2,939)	(2,368)
Other comprehensive income/(loss) before reclassifications	685	31
Reclassification of certain tax effect		(481)
Amounts reclassified from accumulated other comprehensive income (loss)	(40)	(121)
Balance	(2,294)	(2,939)
Investment Securities -All Other AFS [Member]
Balance	(2,979)	(3,218)
Other comprehensive income/(loss) before reclassifications	(1,085)	638
Reclassification of certain tax effect		(435)
Amounts reclassified from accumulated other comprehensive income (loss)	7	36
Balance	(4,057)	(2,979)
Investment Securities HTM [Member]
Balance	(1,347)	(1,354)
Other comprehensive income/(loss) before reclassifications	0	0
Reclassification of certain tax effect		(246)
Amounts reclassified from accumulated other comprehensive income (loss)	45	253
Balance	(1,302)	(1,347)
Cash Flow Hedge (OCI) [Member]
Balance	582	422
Other comprehensive income/(loss) before reclassifications	443	59
Reclassification of certain tax effect		101
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Balance	1,025	582
Pension Plan [Member]
Balance	(17,066)	(14,232)
Other comprehensive income/(loss) before reclassifications	516	(445)
Reclassification of certain tax effect		(3,170)
Amounts reclassified from accumulated other comprehensive income (loss)	220	781
Balance	(16,330)	(17,066)
SERP [Member]
Balance	(844)	(715)
Other comprehensive income/(loss) before reclassifications	0	(82)
Reclassification of certain tax effect		(152)
Amounts reclassified from accumulated other comprehensive income (loss)	29	105
Balance	(815)	(844)
Accumulated Other Comprehensive Loss [Member]
Balance	(24,593)	(21,465)
Other comprehensive income/(loss) before reclassifications	559	201
Reclassification of certain tax effect		(4,383)
Amounts reclassified from accumulated other comprehensive income (loss)	261	1,054
Balance	$ (23,773)	$ (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.

+ References

No definition available.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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