CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Common stock dividends, shares		446,597
Treasury stock, shares		21,945
Stock dividend per dollar amount		$ 15.72
Exercise of Stock Options	39,539	9,378	2,750
Cash dividends	$ 0.54	$ 0.52	$ 0.62
Common Stock - Pre Stock Dividend [Member]
Exercise of Stock Options		8,615	2,500