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
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]        
Fair Value $ 2,153,990 $ 2,368,777 $ 1,982,521 $ 1,504,842
Principal Amount Due Upon Maturity 2,115,136 2,293,895    
Difference $ 38,854 $ 74,882