Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
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	15,227,995	14,911,949
Warrants	2,656,205	2,857,107
Treasury stock, shares	1,678,913	1,678,913