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Mortgage loans (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
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 $ 138,768 $ 74,045 $ 136,455 $ 54,940
Accretable yield additions 20,152 49,626 36,005 73,680
Accretion (14,317) (7,739) (27,857) (12,688)
Reclassification from (to) non-accretable amount, net 39,570 39,570
Balance at end of period 184,173 115,932 184,173 115,932
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 16,151 22,604 18,425 20,686
Accretable yield additions   4,185   8,038
Accretion (2,057) (3,054) (4,331) (4,989)
Reclassification from (to) non-accretable amount, net 2,204 2,204
Balance at end of period $ 16,298 $ 23,735 $ 16,298 $ 23,735