Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Fair Value Option for Mortgage Loans Held for Sale (Details)

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Fair Value Measurements - Summary of Fair Value Option for Mortgage Loans Held for Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]            
Mortgage loans held for sale, at fair value $ 2,239,150 $ 1,982,521 $ 1,504,842 $ 1,713,999 $ 1,333,733 $ 966,171
Mortgage loans held for sale, principal amount due upon maturity 2,166,148   1,485,460      
Difference $ 73,002   $ 19,382