CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND COMPREHENSIVE INCOME (Unaudited)
Cash dividends declared (in dollars per share)	$ 0.50	$ 0.50
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)	7,844	15,480
Cash dividends declared (in dollars per share)	$ 0.50	$ 0.50
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
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)	3,387
Purchase of shares of treasury stock, (in shares)	7,844	15,480
Issuance of shares related to FOFC Merger (in shares)	1,009,942