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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Consolidated Balance Sheets [Abstract]
Capital stock, par value	$ 2	$ 2
Capital stock, shares authorized	20,000,000	20,000,000
Capital stock, shares issued	6,788,407	6,788,407
Prior service cost and unamortized net actuarial losses on employee benefit plans, tax	$ (219)	$ (249)
Net unrealized appreciation on securities available for sale, tax	4,069	2,828
Portion of OTTI attributable to non-credit gains, tax	72	249
Net unrealized depreciation on derivative instruments, tax	$ 1,331	$ 873
Treasury stock, shares	732,600	778,196

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Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax

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Face amount or stated value per share of common stock.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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