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Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended 6 Months Ended
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