Consolidated Statements of Financial Condition (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	10,000,000	5,000,000
Common stock, shares issued	4,876,104	3,057,612
Common stock, shares outstanding	4,809,594	2,998,837
Treasury stock, shares	66,510	58,775