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CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Stockholder's equity:    
Common stock, par value $ 0.01 $ 0.01
Common stock, authorized shares 49,000,000 49,000,000
Common stock, issued shares 27,157,188 27,157,188
Common stock, outstanding shares 27,157,188 27,157,188