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Advances - Schedule of Advance Payments by Financial Institution on Foreclosed Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Advances On Behalf of Borrowers [Line Items]        
Advances $ 779,451 $ 834,512    
Allowance for losses (7,018) (6,273) $ (9,925) $ (23,259)
Advances, net 772,433 828,239 $ 1,056,523  
Principal and interest        
Advances On Behalf of Borrowers [Line Items]        
Advances 228,041 277,132    
Taxes and insurance        
Advances On Behalf of Borrowers [Line Items]        
Advances 381,025 364,593    
Foreclosures, bankruptcy, REO and other        
Advances On Behalf of Borrowers [Line Items]        
Advances $ 170,385 $ 192,787