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Mortgage loans (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 11 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Re-performing loans      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]      
Balance at beginning of period $ 74,045 $ 54,940  
Accretable yield additions 49,626 73,680 $ 60,495
Accretion (7,739) (12,688) (5,555)
Balance at end of period 115,932 115,932 $ 54,940
Non-performing loans      
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]      
Balance at beginning of period 22,604 20,686  
Accretable yield additions 4,185 8,038 $ 22,071
Accretion (3,054) (4,989) (1,385)
Balance at end of period $ 23,735 $ 23,735 $ 20,686