CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY [Abstract]
Cash dividends declared (in dollars per share)	$ 1.00	$ 1.00	$ 1.00
Distribution of shares of treasury stock for directors' compensation (in shares)	10,238	10,378	10,082
Distribution of shares of treasury stock for employee compensation (in shares)	3,453	2,392	2,750
Distribution of shares of treasury stock for directors' deferred compensation (in shares)	3,240	286	25,443
Distribution of shares of treasury stock granted for employee restricted stock awards (in shares)	10,760	8,834	5,886
Forfeit of shares of restricted stock awards (in shares)		1,087
Sale of shares of treasury stock (in shares)	10,100	9,500	6,000
Purchase of shares of treasury stock (in shares)	25,468	21,426	20,260
Issuance of shares related to FOFC Merger (in shares)		1,009,942