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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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