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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Advances On Behalf of Borrowers [Line Items]        
Advances, gross $ 792,837 $ 834,512    
Allowance for losses (6,159) (6,273) $ (7,373) $ (9,925)
Advances, net 786,678 828,239    
Principal and Interest        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross 258,428 277,132    
Taxes and Insurance        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross 348,659 364,593    
Foreclosures, Bankruptcy, REO and Other        
Advances On Behalf of Borrowers [Line Items]        
Advances, gross $ 185,750 $ 192,787