CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.26	$ 0.26
Distribution of shares of treasury stock for directors' compensation (in shares)	9,532	9,673
Distribution of shares of treasury stock for employee stock compensation (in shares)	7,661	3,303
Sale of shares of treasury stock (in shares)	6,252	5,728