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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 64,500,000  
Accrued loan loss 31,100,000 $ 28,200,000
Assets available for recourse 668,400,000  
Warehouse receivables $ 431,300,000  
Letters of credit expiration date 2018-09  
Guarantees total $ 62,300,000  
Commitments to investment in future real estate investment 33,500,000  
Commitments to investment in unconsolidated real estate subsidiary $ 20,400,000  
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 $ 18,500,000,000  
Letters of credit outstanding 53,000,000 $ 45,000,000
SBL Program [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding 5,000,000  
Funded loans not subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 58,000,000