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Commitments and Contingencies - Narrative (Details)
3 Months Ended 6 Months Ended
Apr. 06, 2020
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
loan
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Mortgage Loans on Real Estate          
Aggregate unpaid principal balance of mortgage loans on real estate       $ 26,200,000  
Proceeds from issuance of preferred stock and warrants, net of offering costs $ 125,000,000.0 $ 130,000,000.0 $ 0 $ 124,977,000  
Preferred stock, par value per share (in dollars per share) | $ / shares     $ 0.01   $ 0.01
Warrant term   5 years   5 years  
Class of warrant or right, outstanding (in shares) | shares   6,500,000 6,500,000 6,500,000  
Investment warrants, exercise price (in dollars per share) | $ / shares   $ 10.00   $ 10.00  
Loss contingency     $ 0    
Series A Preferred Stock          
Mortgage Loans on Real Estate          
Preferred stock, shares issued (in shares) | shares   2,307,400 2,307,400 2,307,400 2,307,400
Preferred stock, fixed-to-floating rate cumulative redeemable   7.25% 7.25%    
Preferred stock, par value per share (in dollars per share) | $ / shares   $ 25.00   $ 25.00  
Preferred stock - Series B shares          
Mortgage Loans on Real Estate          
Preferred stock, shares issued (in shares) | shares   2,892,600 2,892,600 2,892,600 2,892,600
Preferred stock, fixed-to-floating rate cumulative redeemable   5.00% 5.00%    
Preferred stock, par value per share (in dollars per share) | $ / shares   $ 25.00   $ 25.00  
Put option          
Mortgage Loans on Real Estate          
Present value of put liability   $ 50,700,000 $ 50,700,000 $ 50,700,000  
Put option | Warrant          
Mortgage Loans on Real Estate          
Present value of put liability     $ 18,400,000    
Re-performing loans | Purchase commitment | One-to-four family residences          
Mortgage Loans on Real Estate          
Number of mortgage loans on real estate | loan     1,489    
Aggregate unpaid principal balance of mortgage loans on real estate     $ 287,600,000