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Real estate assets (Detail Textuals)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
Property
Jun. 30, 2015
USD ($)
Property
Jun. 30, 2016
USD ($)
Property
Jun. 30, 2015
USD ($)
Property
Dec. 31, 2015
USD ($)
Property
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Real Estate [Line Items]                
Number of REO properties foreclosed | Property 103   103   55      
Foreclosed residential properties $ 14,400,000   $ 14,400,000   $ 6,800,000      
Number of REO properties held for rental | Property     3   1      
Aggregate carrying value REO properties $ 800,000   $ 800,000   $ 100,000      
Number of REO properties held-for-sale | Property 41 20 80 45        
Carrying value of real estate held-for-sale transfer $ 4,800,000 $ 2,800,000 $ 9,400,000 $ 7,700,000        
Aggregate carrying value of held for sale $ 16,551,000 $ 9,018,000 $ 16,551,000 $ 9,018,000 $ 10,333,000 $ 13,380,000 $ 5,541,000 $ 1,316,000
Number of held-for-sale residential properties disposed | Property 21 3 39 4        
Gain (loss) on sale of property     $ 1,086,000 $ (9,000)        
Adjustment to record REO properties at lower of cost $ 200,000   200,000          
Other Income                
Real Estate [Line Items]                
Gain (loss) on sale of property $ 500,000 $ 27,000 $ 1,100,000 $ 22,000