CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Common stock cash dividends declared, per share (in dollars per share)	$ 0.38	$ 0.495
Treasury shares purchased under deferred directors' plan (in shares)	13,652	14,741
Treasury stock sold and distributed under deferred directors' plan (in shares)	3,018
Stock activity under stock compensation plans (in shares)	81,909	129,228