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Loans Held for Sale, at Fair Value - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Maximum period of loans held for sale sold 45 days    
Financing receivable recorded investment nonaccural status $ 0   $ 0
Management services, servicing fees and other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income on Loans held for sale 5,800,000 $ 8,600,000  
Gains (Loss) from Mortgage Banking Activities, Net      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gains (loss) recognized on change in fair value on loans held for sale $ 36,100,000 $ 13,300,000