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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance	[1]	$ (11,064)	$ (6,065)	$ (11,577)	$ (7,555)
Other comprehensive income (loss) before reclassifications	[1]	377	48	929	1,615
Amounts reclassified from accumulated other comprehensive loss	[1]	(37)	(40)	(76)	(117)
Net current period other comprehensive income (loss)	[1]	340	8	853	1,498
Ending balance	[1]	(10,724)	(6,057)	(10,724)	(6,057)
Net Unrealized Gains and (Losses) on Investment Securities AFS [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance	[1]	30	1,791	(171)	808
Other comprehensive income (loss) before reclassifications	[1]	116	(126)	356	934
Amounts reclassified from accumulated other comprehensive loss	[1]	(37)	(40)	(76)	(117)
Net current period other comprehensive income (loss)	[1]	79	(166)	280	817
Ending balance	[1]	109	1,625	109	1,625
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance	[1]	(11,094)	(7,856)	(11,406)	(8,363)
Other comprehensive income (loss) before reclassifications	[1]	261	174	573	681
Amounts reclassified from accumulated other comprehensive loss	[1]	0	0	0	0
Net current period other comprehensive income (loss)	[1]	261	174	573	681
Ending balance	[1]	$ (10,833)	$ (7,682)	$ (10,833)	$ (7,682)
[1] Amounts in parentheses indicate debits on the Consolidated Balance Sheets.

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- Definition

Accumulated Other Comprehensive Loss [Line Items]

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No definition available.

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Amounts Reclassified From Accumulated Other Comprehensive Income Loss

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The amount of other comprehensive income (loss) before reclassifications.

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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
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684

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