Subsequent Events - Narrative (Details) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended
	Apr. 28, 2020	Apr. 06, 2020 USD ($) $ / shares shares	May 06, 2020 USD ($) numberOfLoanPools	Mar. 31, 2020 USD ($) loan $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) loan $ / shares	May 03, 2020 $ / shares	Mar. 27, 2020 $ / shares	Mar. 24, 2020 $ / shares
Subsequent Event [Line Items]
Aggregate unpaid principal balance of mortgage loans on real estate | $				$ 26,200	$ 176,900
Estimated market value of the underlying collateral | $				$ 44,200
Preferred Stock, Shares Issued				0	0
Preferred Stock, Par or Stated Value Per Share | $ / shares				$ 0.01	$ 0.01
Preferred Stock, Shares Authorized				25,000,000	25,000,000
Dividends payable, amount per share (in dollars per share) | $ / shares				$ 0.32		$ 0.32			$ 0.32
Residential RPL loan pools
Subsequent Event [Line Items]
Number of mortgage loans on real estate | loan				26		38
Aggregate unpaid principal balance of mortgage loans on real estate | $				$ 2,000		$ 8,500
Subsequent Event
Subsequent Event [Line Items]
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants | $		$ 80,000
Preferred Stock, Par or Stated Value Per Share | $ / shares		$ 25.00
Preferred Stock, Call or Exercise Features		10.00
Preferred Stock, Shares Authorized		4,000,000
Subsequent Event | Minimum [Member]
Subsequent Event [Line Items]
Percentage Of Base Management Fees Payable In Cash	50.00%
Subsequent Event | Maximum [Member]
Subsequent Event [Line Items]
Percentage Of Base Management Fees Payable In Cash	100.00%
Subsequent Event | Series A Preferred Stock
Subsequent Event [Line Items]
Preferred Stock, Shares Issued		820,000
Investment Interest Rate		7.25%
Subsequent Event | Series A Preferred Stock | Second purchase [Member]
Subsequent Event [Line Items]
Preferred Stock, Shares Issued		800,000
Subsequent Event | Series B Preferred Stock
Subsequent Event [Line Items]
Preferred Stock, Shares Issued		2,380,000
Investment Interest Rate		5.00%
Subsequent Event | Series B Preferred Stock | Second purchase [Member]
Subsequent Event [Line Items]
Preferred Stock, Shares Issued		1,000,000
Board of Directors
Subsequent Event [Line Items]
Dividends payable, amount per share (in dollars per share) | $ / shares								$ 0.32
Board of Directors | Subsequent Event
Subsequent Event [Line Items]
Dividends payable, amount per share (in dollars per share) | $ / shares							$ 0.17
Corporate Joint Venture [Member] | Subsequent Event | One Seller
Subsequent Event [Line Items]
Number of transaction | numberOfLoanPools			1
Corporate Joint Venture [Member] | Subsequent Event | Residential RPL loan pools | One Seller
Subsequent Event [Line Items]
Number of mortgage loans on real estate | numberOfLoanPools			677
Aggregate unpaid principal balance of mortgage loans on real estate | $			$ 123,200
Percentage of unpaid principal balance of loan acquired			92.50%
Percentage of estimated market value of the underlying collateral			60.00%
Estimated market value of the underlying collateral | $			$ 189,900