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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Consolidated Balance Sheets [Abstract]    
Securities available for sale, amortized cost $ 490,477 $ 458,370
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 $ (253) $ (251)
Net unrealized appreciation on securities available for sale, tax 4,017 3,997
Portion of OTTI attributable to non-credit losses, tax 254 257
Net unrealized appreciation on derivative instruments, tax $ 810 $ 389
Treasury stock, shares 793,477 842,082