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Advances - Schedule of Advance Payments by Financial Institution on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Advances On Behalf of Borrowers [Line Items]        
Advances $ 228,258 $ 295,834    
Allowance for losses (16,465) (37,952) $ (41,901) $ (70,034)
Advances, net 211,793 257,882 $ 444,298 $ 893,914
Principal And Interest [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances 20,207 31,334    
Taxes And Insurance [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances 144,454 170,131    
Foreclosures Bankruptcy And Other [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances $ 63,597 $ 94,369