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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Consolidated Balance Sheets [Abstract] |  |
Capital stock, par value | $ 2 | $ 2
Capital stock, shares authorized | 20,000,000 | 10,000,000
Capital stock, shares issued | 6,788,407 | 6,788,407
Prior service cost and unamortized net actuarial losses on employee benefit plans, tax | $ (222) | $ (249)
Net unrealized appreciation on securities available for sale, tax | 6,020 | 2,828
Portion of OTTI attributable to non-credit gains, tax | 73 | 249
Net unrealized depreciation on derivative instruments, tax | $ (1,299) | $ (873)
Treasury stock, shares | 758,722 | 778,196

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