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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 91,800,000  
Accrued loan loss 37,000,000.0 $ 37,900,000
Assets available for recourse $ 930,700,000  
Letters of credit expiration date 2020-09  
Guarantees total $ 80,100,000  
Commitments to investment in future real estate investment 72,100,000  
Commitments to investment in unconsolidated real estate subsidiary $ 50,100,000  
Maximum [Member]    
Loss Contingencies [Line Items]    
Co-investments typically range 2.00%  
Warehouse Receivable [Member]    
Loss Contingencies [Line Items]    
Warehouse receivables $ 636,400,000  
Funded loans subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Funded loans unpaid principal 28,000,000,000.0  
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