CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME (Unaudited) [Abstract]
Cash dividends declared (in dollars per share)	$ 0.75	$ 0.75
Distribution of shares of treasury stock for directors' compensation, (in shares)	10,378	10,082
Distribution of shares of treasury stock for employee compensation, (in shares)	2,392	2,750
Purchase of shares of treasury stock, (in shares)	13,981	20,260
Distribution of shares of treasury stock for director's deferred compensation, (in shares)	286
Distribution of shares of treasury stock for employee restricted stock warrants (in shares)	4,387
Sale of shares of treasury stock, (in shares)	3,900
Issuance of shares related to FOFC Merger (in shares)	1,009,942