CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) [Abstract]
Cash dividends declared (in dollars per share)	$ 0.78	$ 0.75
Distribution of shares of treasury stock for directors' compensation (in shares)	7,969	10,238
Distribution of shares of treasury stock for deferred directors' compensation (in shares)	3,356	3,240
Distribution of shares of treasury stock for employee compensation (in shares)	4,116	3,453
Distribution of shares of treasury stock granted for employee restricted stock awards (in shares)		2,095
Purchase of shares of treasury stock (in shares)	3,094	23,120
Sale of shares of treasury stock (in shares)	2,369	10,100
Forfeit of shares of restricted stock awards (in shares)	1,797