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
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]        
Fair Value $ 2,139,346 $ 2,368,777 $ 2,239,150 $ 1,504,842
Principal Amount Due Upon Maturity 2,110,692 2,293,895    
Difference $ 28,654 $ 74,882