CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Common stock cash dividends declared, per share (in dollars per share)	$ 0.19	$ 0.325
Treasury shares purchased under deferred directors' plan (in shares)	7,091	7,204
Treasury stock sold and distributed under deferred directors' plan (in shares)	3,018
Stock activity under stock compensation plans (in shares)	47,234	114,928