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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
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