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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 93,800,000  
Accrued loan loss 57,300,000 $ 37,000,000.0
Assets available for recourse $ 629,700,000  
Letters of credit expiration date 2021-04  
Guarantees total $ 77,400,000  
Commitments to investment in future real estate investment 82,500,000  
Commitments to investment in unconsolidated real estate subsidiary $ 42,700,000  
Maximum [Member]    
Loss Contingencies [Line Items]    
Co-investments typically range 2.00%  
Warehouse Receivable [Member]    
Loss Contingencies [Line Items]    
Warehouse receivables $ 305,500,000  
Funded loans subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Funded loans unpaid principal 28,800,000,000  
Letters of credit outstanding 75,000,000.0 72,000,000.0
SBL Program [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 5,000,000.0 $ 5,000,000.0
Percentage of maximum original principal amount loan loss 10.00%  
Funded loans not subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 80,000,000.0