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Loans and Investments - Non-performing and other Non-Accrued Loans (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Financing Receivable, Past Due [Line Items]        
Number of loans | loan 747 747    
Carrying value of loans $ 12,615,006,000      
Accrued interest receivable related to loans 124,200,000 $ 108,500,000    
Loans and investments, net allowance for credit losses $ 195,664,000 132,559,000 $ 113,241,000 $ 148,329,000
Six Loans Collateralized by a Land Development Project        
Financing Receivable, Past Due [Line Items]        
Number of loans with unpaid principal balance | loan 6      
Unpaid principal balance on loans $ 121,400,000      
Five Loans Collateralized by a Land Development Project        
Financing Receivable, Past Due [Line Items]        
Number of loans with unpaid principal balance | loan 5      
Unpaid principal balance on loans $ 112,100,000      
Weighted average accrual rate of interest (as a percent) 7.91%      
Loans and investments, net allowance for credit losses $ 71,400,000 $ 71,400,000    
Bridge Loans        
Financing Receivable, Past Due [Line Items]        
Number of loans | loan 679 692    
Carrying value of loans $ 12,273,244,000      
Unpaid principal balance on loans   $ 296,900,000    
Multifamily        
Financing Receivable, Past Due [Line Items]        
Loans and investments, net allowance for credit losses 110,847,000 $ 37,961,000 $ 18,707,000 $ 36,468,000
Multifamily | Bridge Loans        
Financing Receivable, Past Due [Line Items]        
Specifically reserved loan, loan loss reserve 3,000,000      
Specifically reserved loan, UPB $ 32,600,000      
Multifamily | Bridge Loans | Financial Asset, Less Than 60 Days Past Due        
Financing Receivable, Past Due [Line Items]        
Number of loans with late and partial payments | loan 24      
Accrued interest receivable related to loans $ 956,900,000      
Non-performing loans        
Financing Receivable, Past Due [Line Items]        
Number of loans | loan 16 4    
Carrying value of loans $ 235,600,000 $ 2,600,000    
Loan loss reserves 27,100,000 5,100,000    
Interest receivable 92,500,000 0    
Non-performing loans | Greater Than 90 Days Past Due        
Financing Receivable, Past Due [Line Items]        
Interest receivable $ 0 $ 0