Consolidated Statement of Changes in Stockholders' Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock options exercised, with no income tax benefit (in shares)	500	850	250
Stock issued capital stock (in shares)		1,600,800
Shares issued direct purchases (in shares)	836	2,085
Shares purchased in Treasury auction (in shares)	16,560
Shares purchased in open market (in shares)	20,440