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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 74,900,000  
Accrued loan loss 40,300,000 $ 37,900,000
Assets available for recourse 618,200,000  
Warehouse receivables $ 331,400,000  
Letters of credit expiration date 2020-02  
Guarantees total $ 62,300,000  
Commitments to investment in future real estate investment 49,100,000  
Commitments to investment in unconsolidated real estate subsidiary $ 50,300,000  
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 $ 24,700,000,000  
Letters of credit outstanding 64,000,000 64,000,000
SBL Program [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding 5,000,000 $ 5,000,000
Funded loans not subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 69,000,000