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Fair Value Measurements - Unobservable Input Reconciliation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Securitized Debt | Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure    
Fair Value, Assets Measured on Recurring Basis [Roll Forward]    
Other than temporary credit impairment losses $ 0 $ 0
Realized gains (losses) on sales and settlements (35,273) (122)
Net unrealized gains (losses) included in income (78,289) (89,766)
Fair Value, Liabilities Measured on Recurring Basis [Roll Forward]    
Securitized Debt, Beginning balance, Level 3 (6,941,097) (3,720,496)
Securitized Debt, Transfers in to Level 3 assets 0 0
Securitized Debt, Transfers out of Level 3 assets 0 0
Securitized Debt, Purchases (5,173,430) (4,797,255)
Securitized Debt, Principal payments 1,787,368 1,059,854
Securitized Debt, Sales and Settlements 1,056,765 608,816
Securitized Debt, Accretion (amortization) of purchase discounts (4,701) (2,128)
Securitized Debt, Gains (losses) included in other comprehensive income 0 0
Securitized Debt, Ending balance, Level 3 (9,388,657) (6,941,097)
Non-agency MBS    
Fair Value, Assets Measured on Recurring Basis [Roll Forward]    
Beginning balance Level 3 assets 3,330,063 3,675,841
Transfers in to Level 3 assets 6,112 0
Transfers out of Level 3 assets 0 0
Purchases 78,400 257,914
Principal payments (568,339) (532,696)
Sales and settlements (68,162) (149,938)
Accretion (amortization) of purchase discounts 120,119 120,638
Other than temporary credit impairment losses (59,881) (57,986)
Realized gains (losses) on sales and settlements 12,031 13,761
Net unrealized gains (losses) included in income (9,733) 3,173
Total unrealized gains (losses) for the period 10,706 (644)
Ending balance Level 3 assets 2,851,316 3,330,063
Loans held for investment | Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure    
Fair Value, Assets Measured on Recurring Basis [Roll Forward]    
Beginning balance Level 3 assets 8,753,653 4,768,416
Transfers in to Level 3 assets 0 0
Transfers out of Level 3 assets 0 0
Purchases 6,539,765 4,897,370
Principal payments (1,788,409) (1,022,414)
Sales and settlements 2,876 5,007
Accretion (amortization) of purchase discounts (35,803) (41,363)
Other than temporary credit impairment losses 0 0
Realized gains (losses) on sales and settlements 0 0
Net unrealized gains (losses) included in income 206,181 146,637
Total unrealized gains (losses) for the period 0 0
Ending balance Level 3 assets $ 13,678,263 $ 8,753,653