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Loans Held for Sale, at Fair Value - Summary of Loans Held for Sale at Cost Basis and Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable    
Loans held for sale, at fair value $ 821,194 $ 1,086,805
Cost Basis    
Accounts, Notes, Loans and Financing Receivable    
Loans held for sale, at fair value 817,159 1,062,511
Fair Value    
Accounts, Notes, Loans and Financing Receivable    
Loans held for sale, at fair value $ 821,194 $ 1,086,805