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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 90,800,000  
Accrued loan loss 43,700,000 $ 37,900,000
Assets available for recourse 1,200,000,000  
Advance warehouse funding $ 376,707,000  
Letters of credit expiration date 2020-07  
Guarantees total $ 56,400,000  
Commitments to investment in future real estate investment 55,200,000  
Commitments to investment in unconsolidated real estate subsidiary $ 45,800,000  
Maximum [Member]    
Loss Contingencies [Line Items]    
Co-investments typically range 2.00%  
Funded loans subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Funded loans unpaid principal $ 27,200,000,000  
Letters of credit outstanding 72,000,000.0 64,000,000.0
SBL Program [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding 5,000,000.0 $ 5,000,000.0
Funded loans not subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding 77,000,000.0  
Warehouse Receivable [Member]    
Loss Contingencies [Line Items]    
Warehouse receivables $ 486,500,000