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Summary of Significant Accounting Policies - Narrative (Details) |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |
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Apr. 06, 2020 USD ($) | Jan. 01, 2020 USD ($) | Jun. 07, 2016 | Jun. 30, 2021 USD ($) entity $ / shares shares | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) entity Segment $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Nov. 19, 2018 USD ($) | Aug. 18, 2017 USD ($) | Apr. 25, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of loan discount reclassified |  | $ (10,200,000) |  |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 0.01 |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 25.00 |  |  | $ 25.00 |  |  |  |
Warrant term |  |  |  |  |  |  | 5 years |  |  | 5 years |  |  |  |
Class of warrant or right, outstanding (in shares) | shares |  |  |  | 6,500,000 |  |  | 6,500,000 |  | 6,500,000 | 6,500,000 |  |  |  |
Investment warrants, exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 10.00 |  |  | $ 10.00 |  |  |  |
Warrants original basis |  |  |  | $ 9,500,000 |  |  | $ 9,500,000 |  | $ 9,500,000 | $ 9,500,000 |  |  |  |
Convertible notes payable |  |  |  | 5,000,000.0 | $ 2,500,000 | $ 2,500,000 |  | $ 8,000,000.0 | 5,000,000.0 |  |  |  |  |
Payments for repurchase of convertible notes |  |  |  | 5,100,000 | 2,400,000 | 2,300,000 |  | 8,200,000 | $ 5,100,000 |  |  |  |  |
Convertible senior notes repurchase |  |  |  | 0 | $ 0 | $ 0 |  | $ 81,000 |  |  |  |  |  |
Percentage of incentive fees payable in cash |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Minimum assets with banking institutions |  |  |  | $ 1,000,000,000 |  |  |  |  | $ 1,000,000,000 |  |  |  |  |
Number of taxable subsidiaries | entity |  |  |  | 2 |  |  |  |  | 2 |  |  |  |  |
Property held-for-sale |  |  |  | $ 4,400,000 |  |  |  |  | $ 4,400,000 |  | $ 7,800,000 |  |  |
Rental properties |  |  |  | 400,000 |  |  |  |  | 400,000 |  | 700,000 |  |  |
Put option liability |  |  |  | 18,350,000 |  |  |  |  | 18,350,000 |  | $ 14,205,000 |  |  |
Loans and securities, credit loss expenses |  |  |  |  |  |  | 500,000 |  |  | 900,000 |  |  |  |
Loss from loan settlement |  |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |
Loan transaction expense |  |  |  |  |  |  | 65,000 |  |  | (38,000) |  |  |  |
Number of operating segments | Segment |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Put option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Present value of put liability |  |  |  | $ 50,700,000 |  |  | $ 50,700,000 |  | $ 50,700,000 | $ 50,700,000 |  |  |  |
Put option liability term |  |  |  |  |  |  |  |  | 39 months |  |  |  |  |
7.25% Series A preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) | shares |  |  |  | 2,307,400 |  |  | 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, liquidation preference per share (in dollars per share) | $ / shares |  |  |  | $ 25.00 |  |  |  |  | $ 25.00 |  | $ 25.00 |  |  |
Preferred stock - Series B shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) | shares |  |  |  | 2,892,600 |  |  | 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 |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares |  |  |  | $ 25.00 |  |  |  |  | $ 25.00 |  | $ 25.00 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of an assets |  |  |  |  |  |  |  |  | 27 years 6 months |  |  |  |  |
Servicing agreement | Servicer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of fair market value of REO |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Percentage of purchase price of REO |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Renewal term |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Servicing agreement | Servicer | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing fees percentage |  |  |  |  |  |  |  |  | 0.65% |  |  |  |  |
Servicing agreement | Servicer | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing fees percentage |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |
Amended and restated management agreement | Thetis Asset Management LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of common shares held as base management fee (at least) |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
2014 Director Equity Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available under for distribution (in shares) | shares |  |  |  | 60,000 |  |  |  |  | 60,000 |  |  |  |  |
Percentage of annual retainer received in shares |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |
Percentage of annual retainer received in cash |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |
2014 Director Equity Plan | Restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual retainer amount |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |
Long Term Incentive Plan | Restricted stock | IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock awards issued to independent directors (in shares) | shares |  |  |  |  |  |  |  |  | 2,000 |  |  |  |  |
2016 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares on a fully diluted basis (up to) |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Fraction of award vesting period |  |  | 0.3333 |  |  |  |  |  |  |  |  |  |  |
Convertible notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 87,500,000
Additional aggregate principal |  |  |  |  |  |  |  |  |  |  |  | $ 15,900,000 | $ 20,500,000 |
Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.25%
Principal amount of note (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 25.00 |  |  |  |  |
Cumulative discount |  |  |  |  |  |  |  |  | $ 3,200,000 |  |  |  |  |
Common stock | Convertible notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate |  |  |  |  |  |  |  |  | 1.7279 |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 14.47 |  |  |  |  | $ 14.47 |  |  |  |  |

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