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Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 06, 2020
$ / shares
shares
Jan. 01, 2020
USD ($)
Apr. 01, 2019
USD ($)
Jun. 07, 2016
Jul. 08, 2014
Jun. 30, 2020
USD ($)
numberOfSubsidiaries
numberOfLoanPools
$ / shares
shares
Mar. 31, 2020
USD ($)
numberOfLoanPools
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
numberOfLoanPools
numberOfSubsidiaries
$ / shares
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
shares
Nov. 19, 2018
USD ($)
Aug. 18, 2017
USD ($)
Apr. 25, 2017
USD ($)
Summary Of Significant Accounting Policies [Line Items]                                
Number of loan pools | numberOfLoanPools           6 4     6            
Amortization of debt discount                       $ 3,200,000        
Convertible senior note repurchase             $ 81,000     $ 100,000            
Convertible Notes Payable           $ 8,000,000.0       8,000,000.0            
Payments for Repurchase of Convertible Notes           8,200,000       8,200,000            
Provision for credit losses   $ (10,200,000)       $ 0   $ 0   $ 10,156,000 $ 0          
Number of taxable subsidiaries | numberOfSubsidiaries           2       2            
Minimum assets with banking institutions           $ 1,000,000,000       $ 1,000,000,000            
Proceeds from issuance of preferred stock and warrants, net of offering costs           $ 130,000,000.0       $ 124,977,000 $ 0          
Preferred Stock, Shares Issued | shares           0       0     0      
Class of Warrant or Right, Outstanding | shares 6,500,000                              
Preferred Stock, Liquidation Preference Per Share | $ / shares $ 25.00         $ 25.00       $ 25.00            
Investment warrants, exercise price (in dollars per share) | $ / shares $ 10.00                              
Other Commitment           $ 11,102,000       $ 11,102,000            
Put Option [Member]                                
Summary Of Significant Accounting Policies [Line Items]                                
Other Commitment           50,700,000       50,700,000            
Warrant [Member] | Put Option [Member]                                
Summary Of Significant Accounting Policies [Line Items]                                
Other Commitment           $ 11,100,000       $ 11,100,000            
Series B Preferred Stock                                
Summary Of Significant Accounting Policies [Line Items]                                
Preferred Stock, Shares Issued | shares 2,892,600                              
Preferred Stock, Dividend Rate, Percentage 5.00%                 5.00%            
Series A Preferred Stock                                
Summary Of Significant Accounting Policies [Line Items]                                
Preferred Stock, Shares Issued | shares 2,307,400                              
Preferred Stock, Dividend Rate, Percentage 7.25%                 7.25%            
Beneficial interests                                
Summary Of Significant Accounting Policies [Line Items]                                
Provision for credit losses   $ (4,200,000)                            
Minimum                                
Summary Of Significant Accounting Policies [Line Items]                                
Estimated useful lives of an assets                   27 years 6 months            
Servicing Agreement | Gregory                                
Summary Of Significant Accounting Policies [Line Items]                                
Servicing fees percentage                   0.42%            
Percentage of Fair Market Value of REO         1.00%                      
Servicing Fees, Consecutive Payments | numberOfLoanPools                   7            
Percentage of Purchase Price of REO         1.00%                      
Servicing Agreement | Gregory | Minimum                                
Summary Of Significant Accounting Policies [Line Items]                                
Servicing fees percentage                   0.65%            
Servicing Agreement | Gregory | Maximum                                
Summary Of Significant Accounting Policies [Line Items]                                
Servicing fees percentage                   1.25%            
Amended And Restated Management Agreement [Member] | Thetis                                
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           78,000       78,000            
Vesting period                   1 year            
Annual Retainer Received In Shares     40.00%           50.00%              
Annual Retainer Received In Cash     60.00%           50.00%              
2014 Director Equity Plan | Restricted stock                                
Summary Of Significant Accounting Policies [Line Items]                                
Number of shares issued to independent directors (in shares) | shares                   2,000            
Annual retainer amount     $ 100,000           $ 75,000              
2016 Equity Incentive Plan                                
Summary Of Significant Accounting Policies [Line Items]                                
Vesting period       3 years                        
Fraction of award vesting period       0.3333                        
Percentage of outstanding shares on a fully diluted basis (up to)       5.00%                        
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%       7.25%         7.25% 7.25%
Principal amount of note (in dollars per share) | $ / shares           $ 25.00                    
Amortization of debt discount           $ 400,000       $ 700,000            
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