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Mortgage loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Jun. 30, 2015
Re-performing loans | Three months ended    
Mortgage Loans on Real Estate [Line Items]    
Contractually required principal and interest $ 120,524 $ 332,571
Non-accretable amount (48,244) (132,557)
Expected cash flows to be collected 72,280 200,014
Accretable yield (20,152) (49,626)
Fair value at acquisition 52,128 150,388
Re-performing loans | Six months ended    
Mortgage Loans on Real Estate [Line Items]    
Contractually required principal and interest 202,703 486,603
Non-accretable amount (77,392) (198,704)
Expected cash flows to be collected 125,311 287,899
Accretable yield (36,005) (73,680)
Fair value at acquisition 89,306 214,219
Non-performing loans | Three months ended    
Mortgage Loans on Real Estate [Line Items]    
Contractually required principal and interest 31,827
Non-accretable amount (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 amount (38,317)
Expected cash flows to be collected 27,358
Accretable yield (8,038)
Fair value at acquisition $ 19,320