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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 |  |

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