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Summary of Significant Accounting Policies - Additional Information (Details)
9 Months Ended
Jun. 16, 2021
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Jun. 14, 2021
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Sep. 30, 2021
USD ($)
Loan
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Jun. 30, 2021
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Dec. 31, 2020
USD ($)
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Significant Accounting Policies [Line Items]          
Percentage of senior mortgage loan transferred to third-party     100.00%    
Maximum insured amount of each cash account | $     $ 250,000   $ 250,000
Cash | $     $ 15,000,000.0   $ 19,100,000
Series B Preferred Stock          
Significant Accounting Policies [Line Items]          
Temporary equity, shares redeemed 9,000,000        
Temporary equity, shares outstanding 0   0 0  
Series C Preferred Stock          
Significant Accounting Policies [Line Items]          
Preferred stock, shares issued   8,050,000 8,050,000   0
Preferred stock, dividend rate   6.25%      
Commercial Real Estate Loans | Minimum          
Significant Accounting Policies [Line Items]          
Number of performance loan | Loan     120,000