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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Preferred stock, par value $ 10 $ 10
Preferred stock, shares authorized 500,000 500,000
Preferred stock, shares issued 0 0
Common stock, par value $ 2.50 $ 2.50
Common stock, shares authorized 10,000,000 10,000,000
Common stock, shares issued 3,472,186 3,468,243
Common stock, unvested restricted shares 19,301 14,901