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CONDENSED CONSOLIDATED STATEMENTS OF CONDITION -UNAUDITED (Parenthetical) - $ / shares
Sep. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Common stock, par value $ 1 $ 1
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 23,990,370 23,901,084
Common stock, shares outstanding 23,990,370 23,901,084