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Fair Value Measurements - Fair Value Option for Mortgage Loans Held for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value Disclosures [Abstract]    
Mortgage loans held for sale, at fair value $ 10,685,144 $ 19,323,568
Mortgage loans held for sale, unpaid principal balance 10,798,888 19,018,552
Difference $ (113,744) $ 305,016