Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Stockholders' equity:
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	100,000	100,000
Preferred stock, shares outstanding
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	29,900,000	29,900,000
Common stock, shares issued	8,884,508	8,884,508
Treasury stock, shares	1,678,913	1,678,913