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Other Assets (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Premises and Equipment, net    
Premises and equipment 15,101us-gaap_PropertyPlantAndEquipmentGross $ 14,805us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (13,212)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (12,279)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total premises and equipment, net 1,889us-gaap_PropertyPlantAndEquipmentNet 2,526us-gaap_PropertyPlantAndEquipmentNet
Servicer Advances    
Servicer advances 556imh_ServicingAdvancesCurrentAndNoncurrent $ 1,343imh_ServicingAdvancesCurrentAndNoncurrent
Minimum    
Premises and Equipment, net    
Useful lives P3Y  
Maximum    
Premises and Equipment, net    
Useful lives P20Y