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Advances - Schedule of Advance Payments by Financial Institution on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Advances On Behalf of Borrowers [Line Items]        
Advances $ 272,641 $ 228,258    
Allowance for losses (23,259) (16,465) $ (37,952) $ (41,901)
Advances, net 249,382 211,793 $ 257,882 $ 444,298
Principal And Interest [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances 43,671 20,207    
Taxes And Insurance [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances 160,373 144,454    
Foreclosures Bankruptcy And Other [Member]        
Advances On Behalf of Borrowers [Line Items]        
Advances $ 68,597 $ 63,597