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Commitments and Contingencies (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]    
Funded loans unpaid principal $ 34,600,000,000  
Letters of credit outstanding 145,700,000  
Accrued loan loss 61,200,000 $ 57,100,000
Assets available for recourse 796,100,000  
Guarantees total $ 38,700,000  
Co-investments typically range 2.00%  
Commitments to investment in future real estate investment $ 118,700,000  
Commitments to investment in unconsolidated real estate subsidiary 55,500,000  
Forbearance Of Loans, CARES Act    
Loss Contingencies [Line Items]    
Advances for principal and interest 9,300,000  
Reimbursement of advances 5,600,000  
Warehouse Receivable    
Loss Contingencies [Line Items]    
Warehouse receivables 323,900,000  
Funded loans subject to loss sharing arrangements    
Loss Contingencies [Line Items]    
Funded loans unpaid principal 30,000,000,000.0  
Funded loans not subject to loss sharing arrangements    
Loss Contingencies [Line Items]    
Letters of credit outstanding 95,000,000.0 95,000,000.0
SBL Program    
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%