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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 101,200,000  
Accrued loan loss 61,300,000 $ 37,000,000.0
Assets available for recourse $ 606,100,000  
Letters of credit expiration date 2021-06  
Guarantees total $ 79,600,000  
Commitments to investment in future real estate investment 91,200,000  
Commitments to investment in unconsolidated real estate subsidiary $ 43,900,000  
Maximum [Member]    
Loss Contingencies [Line Items]    
Co-investments typically range 2.00%  
COVID 19 Pandemic [Member]    
Loss Contingencies [Line Items]    
Advances for principal and interest $ 2,300,000  
Warehouse Receivable [Member]    
Loss Contingencies [Line Items]    
Warehouse receivables 279,600,000  
Funded loans subject to loss sharing arrangements [Member]    
Loss Contingencies [Line Items]    
Funded loans unpaid principal 29,400,000,000  
Letters of credit outstanding 82,000,000.0 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 $ 87,000,000.0