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Fair Value of Financial Instruments - Changes in Recurring Fair Value Measurements Included in Earnings (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of net trust assets, excluding trust REO $ 4,096 $ 6,156  
Securitized mortgage collateral      
Difference between aggregate unpaid principal balance and fair value of securitized mortgage collateral (25,243)   $ 20,250
Securitized Mortgage Borrowings      
Outstanding principal balance of securitized mortgage borrowings 4,696,971   4,931,849
Derivative liabilities, net, securitized trusts | TBA's      
Derivative assets and liabilities      
Derivative Liability, Notional Amount     485,459
Total Losses (10,271) (1,476)  
Derivative assets - IRLCs | Interest rate lock commitments. net (IRLCs)      
Derivative assets and liabilities      
Derivative Assets, Notional Balance 940,750   419,035
Total Losses (6,928) (187)  
Mortgage loans held-for-sale | Forward delivery loan commitment      
Derivative assets and liabilities      
Derivative Assets, Notional Balance 232,500   232,530
Recurring basis      
Change in Fair Value Included in Net Earnings (Loss)      
Total (80,555) (16,931)  
Recurring basis | Interest Income      
Change in Fair Value Included in Net Earnings (Loss)      
Total (4,807) 6,255  
Recurring basis | Interest Expense      
Change in Fair Value Included in Net Earnings (Loss)      
Total (10,087) (13,667)  
Recurring basis | Change in Fair Value of Net Trust Assets      
Change in Fair Value Included in Net Earnings (Loss)      
Total (4,096) (6,156)  
Recurring basis | Change in Fair Value of Long-term Debt      
Change in Fair Value Included in Net Earnings (Loss)      
Total 9,036 265  
Recurring basis | Other Revenue and Expense      
Change in Fair Value Included in Net Earnings (Loss)      
Total (18,831) (6,488)  
Recurring basis | (Loss) Gain on Sale of Loans, net      
Change in Fair Value Included in Net Earnings (Loss)      
Total (51,770) 2,860  
Recurring basis | Securitized mortgage borrowings      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of liabilities 235,358 (40,793)  
Recurring basis | Securitized mortgage borrowings | Interest Expense      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of liabilities (9,926) (13,553)  
Recurring basis | Securitized mortgage borrowings | Change in Fair Value of Net Trust Assets      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of liabilities 245,284 (27,240)  
Recurring basis | Derivative liabilities, net, securitized trusts | Hedging Instruments      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of liabilities 651 (422)  
Recurring basis | Derivative liabilities, net, securitized trusts | Hedging Instruments | (Loss) Gain on Sale of Loans, net      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of liabilities 651 (422)  
Recurring basis | Long-term debt      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of liabilities 8,875 151  
Recurring basis | Long-term debt | Interest Expense      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of liabilities (161) (114)  
Recurring basis | Long-term debt | Change in Fair Value of Long-term Debt      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of liabilities 9,036 265  
Recurring basis | Securitized mortgage collateral      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of assets (254,187) 27,339  
Recurring basis | Securitized mortgage collateral | Interest Income      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of assets (4,807) 6,255  
Recurring basis | Securitized mortgage collateral | Change in Fair Value of Net Trust Assets      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of assets (249,380) 21,084  
Recurring basis | Mortgage servicing rights      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of assets (18,831) (6,488)  
Recurring basis | Mortgage servicing rights | Other Revenue and Expense      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of assets (18,831) (6,488)  
Recurring basis | Derivative assets - IRLCs      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of assets (6,928) (187)  
Recurring basis | Derivative assets - IRLCs | (Loss) Gain on Sale of Loans, net      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of assets (6,928) (187)  
Recurring basis | Mortgage loans held-for-sale      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of assets (45,493) 3,469  
Recurring basis | Mortgage loans held-for-sale | (Loss) Gain on Sale of Loans, net      
Change in Fair Value Included in Net Earnings (Loss)      
Change in fair value of assets (45,493) $ 3,469  
Recurring basis | Level 3      
Long-term debt      
Estimated fair value of long-term debt 39,632   $ 45,434
Recurring basis | Level 3 | Long-term debt      
Long-term debt      
Long-term debt unpaid principal balance 62,000    
Estimated fair value of long-term debt 39,600    
Difference between aggregate unpaid principal balances and fair value of long-term debt 22,400    
Recurring basis | Level 3 | Securitized mortgage collateral      
Securitized mortgage collateral      
Unpaid principal balance of securitized mortgage collateral 2,700,000    
Estimated fair value of securitized mortgage collateral 2,200,000    
Difference between aggregate unpaid principal balance and fair value of securitized mortgage collateral 500    
Unpaid principal balance of loans 90 days or more past due 400,000    
Estimated fair value of loans 90 days or more past due 100,000    
Difference between aggregate unpaid principal balances and fair value of mortgage loans 300,000    
Securitized Mortgage Borrowings      
Outstanding principal balance of securitized mortgage borrowings 2,700,000    
Estimated fair value of securitized mortgage borrowings 2,200,000    
Bond losses 2,200,000    
Difference between aggregate unpaid principal balances and fair value of securitized mortgage borrowings $ 500,000