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Sale of the asset management unit and discontinued operations (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Fees and commissions, net $ 13,669 $ 10,021 $ 10,619
Gain (Loss) on Disposition of Assets, Total 455    
Investment fund trading [Member]
     
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Fees and commissions, net $ 567 $ 2,588 $ 2,832