CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Statement of Stockholders Equity [Abstract]
Common stock cash dividends declared, per share (in dollars per share)	$ 0.465	$ 0.465
Treasury shares purchased under deferred directors' plan (in shares)	10,187	10,254
Treasury stock sold and distributed under deferred directors' plan (in shares)	30,100	4,477
Stock activity under stock compensation plans (in shares)	42,200	54,108
Redemption of shares of preferred stock (in shares)	0	56,044