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Fair Value Measurements - Unobservable Input Reconciliation (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Non-Agency RMBS      
Fair Value, Assets Measured on Recurring Basis [Roll Forward]      
Beginning balance Level 3 $ 2,614,408 $ 2,614,408 $ 2,486,130
Transfers into Level 3   135,118 0
Transfers out of Level 3 (135,000) (135,118) 0
Purchases of assets/ issuance of debt   19,512 497,848
Principal payments   (124,351) (415,518)
Sales and settlements   (141,912) (38,605)
Net accretion (amortization)   20,667 95,562
Gains (losses) included in net income      
(Increase) decrease in provision for credit losses   (1,817) (4,853)
Realized gains (losses) on sales and settlements   15,096 (1,088)
Net unrealized gains (losses) included in income   (31,013) 28,577
Gains (losses) included in other comprehensive income      
Total unrealized gains (losses) for the period   (186,420) (33,645)
Ending balance Level 3   2,184,170 2,614,408
Variable Interest Entities, Primary Beneficiary | Securitized Debt      
Fair Value, Liabilities Measured on Recurring Basis [Roll Forward]      
Securitized Debt, Beginning balance, Level 3 8,179,608 8,179,608 8,455,376
Securitized Debt, Transfers in to Level 3 assets   0 0
Securitized Debt, Transfers out of Level 3 assets   0 0
Securitized Debt, Purchases of assets/ issuance of debt   1,462,493 1,487,286
Securitized Debt, Principal payments   (773,422) (1,530,818)
Securitized Debt, Sales and Settlements   (146,663) (314,454)
Securitized Debt, Net accretion (amortization)   (24,677) (26,758)
Securitized Debt, Other than temporary credit impairment losses   0 0
Securitized Debt, Realized gains (losses) on sales and settlements   (459) (9,925)
Securitized Debt, Net unrealized gains (losses) included in income   (166,769) 118,901
Securitized Debt, Gains (losses) included in other comprehensive income   0 0
Securitized Debt, Ending balance, Level 3   8,530,111 8,179,608
Variable Interest Entities, Primary Beneficiary | Loans held for investment      
Fair Value, Assets Measured on Recurring Basis [Roll Forward]      
Beginning balance Level 3 $ 14,292,815 14,292,815 12,572,581
Transfers into Level 3   0 0
Transfers out of Level 3   0 0
Purchases of assets/ issuance of debt   177,857 5,086,491
Principal payments   (895,764) (1,717,745)
Sales and settlements   6,662 (1,812,760)
Net accretion (amortization)   (49,064) (77,491)
Gains (losses) included in net income      
(Increase) decrease in provision for credit losses   0 0
Realized gains (losses) on sales and settlements   0 1,590
Net unrealized gains (losses) included in income   (495,673) 240,149
Gains (losses) included in other comprehensive income      
Total unrealized gains (losses) for the period   0 0
Ending balance Level 3   $ 13,036,833 $ 14,292,815