CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) [Abstract]
Cash dividends declared (in dollars per share)	$ 0.52	$ 0.5
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)		1,079
Purchase of shares of treasury stock (in shares)	3,094	19,098
Sale of shares of treasury stock (in shares)	2,369