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Advances - Schedule of Advance Payments by Financial Institution on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Advances On Behalf of Borrowers [Line Items]        
Advances $ 295,834 $ 486,199    
Allowance for losses (37,952) (41,901) $ (70,034) $ (38,377)
Advances, net 257,882 444,298 $ 893,914 $ 890,832
Principal And Interest [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances 31,334 81,681    
Taxes And Insurance [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances 170,131 278,487    
Foreclosures Bankruptcy And Other [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances $ 94,369 $ 126,031