Consolidated Balance Sheets (unaudited) (Parenthetical) - $ / shares	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50	$ 2.50
Common stock, shares authorized	20,000,000	20,000,000	20,000,000
Common stock, shares issued	10,857,801	10,853,566	10,844,912
Common stock, shares outstanding	10,701,841	10,671,744	10,658,199
Preferred Stock, Par or Stated Value Per Share	$ 1	$ 1	$ 1
Preferred Stock, Shares Authorized	250,000	250,000	250,000
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares	155,960	181,822	186,713