Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Summary of the components of net fair value gains on mortgage loans and related obligations (Detail)

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Fair Value - Summary of the components of net fair value gains on mortgage loans and related obligations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2020
Summary of the components of net fair value gains on mortgage loans and related obligations [Line Items]        
Interest income on mortgage loans $ 173,940 $ 160,568 $ 217,841 $ 401,513
Change in fair value of mortgage loans 84,983 (51,346) 180,904 82,338
Change in fair value of mortgage backed securities     (1,470) 817
Net fair value gains on mortgage loans 258,923 109,222 397,275 484,668
Interest expense on related obligations (113,474) (119,201) (127,488) (261,845)
Change in fair value of derivatives (46,478) 43,972 8,567 (5,743)
Change in fair value of related obligations 32,180 42,670 (166,051) (91,397)
Net fair value losses on related obligations (127,772) (32,559) (284,972) (358,985)
Net fair value gains on mortgage loans and related obligations $ 131,151 $ 76,663 $ 112,303 $ 125,683