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Real estate assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Real Estate Held For Sale [Roll Forward]        
Balance at beginning of period $ 13,380 $ 5,541 $ 10,333 $ 1,316
Transfers from mortgage loans 5,019 3,574 9,851 7,669
Adjustments to record at lower of cost or fair value (154)   (200)  
Disposals (2,324) (326) (4,137) (363)
Other 630 229 704 396
Balance at end of period $ 16,551 $ 9,018 $ 16,551 $ 9,018