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Mortgage loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Re-performing loans    
Mortgage Loans on Real Estate [Line Items]    
Contractually required principal and interest   $ 393,657
Non-accretable yield   (173,502)
Expected cash flows to be collected   220,155
Accretable yield   (60,495)
Fair value at acquisition   159,660
Re-performing loans | Three months ended    
Mortgage Loans on Real Estate [Line Items]    
Contractually required principal and interest $ 332,571  
Non-accretable yield (132,557)  
Expected cash flows to be collected 200,014  
Accretable yield (49,626)  
Fair value at acquisition 150,388  
Re-performing loans | Six months ended    
Mortgage Loans on Real Estate [Line Items]    
Contractually required principal and interest 486,603  
Non-accretable yield (198,704)  
Expected cash flows to be collected 287,899  
Accretable yield (73,680)  
Fair value at acquisition 214,219  
Non-performing loans    
Mortgage Loans on Real Estate [Line Items]    
Contractually required principal and interest   257,790
Non-accretable yield   (184,096)
Expected cash flows to be collected   73,694
Accretable yield   (22,071)
Fair value at acquisition   $ 51,623
Non-performing loans | Three months ended    
Mortgage Loans on Real Estate [Line Items]    
Contractually required principal and interest 31,827  
Non-accretable yield (18,598)  
Expected cash flows to be collected 13,229  
Accretable yield (4,185)  
Fair value at acquisition 9,044  
Non-performing loans | Six months ended    
Mortgage Loans on Real Estate [Line Items]    
Contractually required principal and interest 65,675  
Non-accretable yield (38,317)  
Expected cash flows to be collected 27,358  
Accretable yield (8,038)  
Fair value at acquisition $ 19,320