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Borrowings - Schedule of Assets Held as Collateral Related to Secured Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Cash $ 284,802 $ 428,339    
Restricted cash 72,463 64,001    
MSRs 1,294,817 1,486,395    
Advances, net 828,239 1,056,523    
Loans held for sale 387,836 275,269    
Loans held for investment 7,006,897 6,292,938    
Receivables, net 187,665 201,220    
Premises and equipment, net 16,925 38,274    
Other assets 571,483 563,240    
Balance 10,651,127 10,406,199 $ 9,394,216  
Servicing Asset at Fair Value, Amount (1,294,817) $ (1,486,395) $ (1,457,149) $ (671,962)
Match Funded Liabilities        
Debt Instrument [Line Items]        
Cash 0      
Restricted cash 14,195      
MSRs 0      
Advances, net 651,576      
Loans held for sale 0      
Loans held for investment 0      
Receivables, net 0      
Premises and equipment, net 0      
Other assets 0      
Balance 665,771      
Financing Liabilities        
Debt Instrument [Line Items]        
Cash 0      
Restricted cash 0      
MSRs 566,952      
Advances, net 0      
Loans held for sale 0      
Loans held for investment 6,882,022      
Receivables, net 0      
Premises and equipment, net 0      
Other assets 0      
Balance 7,448,974      
Mortgage Loan Warehouse/MSR Facilities        
Debt Instrument [Line Items]        
Cash 0      
Restricted cash 5,945      
MSRs 728,420      
Advances, net 82,147      
Loans held for sale 359,131      
Loans held for investment 96,302      
Receivables, net 47,187      
Premises and equipment, net 0      
Other assets 6,334      
Balance 1,325,466      
Sales and Other Commitments        
Debt Instrument [Line Items]        
Cash 0      
Restricted cash 52,323      
MSRs 0      
Advances, net 0      
Loans held for sale 0      
Loans held for investment 0      
Receivables, net 0      
Premises and equipment, net 0      
Other assets 497,616      
Balance 549,939      
Other        
Debt Instrument [Line Items]        
Cash 284,802      
Restricted cash 0      
MSRs 0      
Advances, net 94,516      
Loans held for sale 28,705      
Loans held for investment 28,573      
Receivables, net 140,478      
Premises and equipment, net 16,925      
Other assets 67,533      
Balance 661,532      
Mortgage servicing rights, at fair value (16,300)      
Certain Cohorts | Other        
Debt Instrument [Line Items]        
Mortgage servicing rights, at fair value (600)      
Servicing Asset at Fair Value, Amount $ (16,900)