Commitments and Contingencies - Narrative (Details)	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) $ / shares shares	Mar. 31, 2023	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) series $ / shares shares	Jun. 30, 2023 USD ($) loan $ / shares shares	Jun. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Commitments and Contingencies
Proceeds from issuance of private placement				$ 125,000,000
Number of preferred stock series issued | series				2
Number of warrants series issued | series				2
Warrant term (in years)				5 years
Class of warrant or right, outstanding (in shares) | shares	1,950,672		5,250,000	6,500,000	1,950,672	5,250,000
Investment warrants, exercise price (in dollars per share) | $ / shares				$ 10.00
Preferred stock, face value per share (in dollars per share) | $ / shares			$ 25.00			$ 25.00	$ 25.00
Class of warrant or right, shares repurchased and retired (in shares) | shares			1,250,000			1,250,000	4,549,328
Payments for repurchase and retirement of warrants	$ 0		$ 9,200,000		$ 0	$ 9,200,000	$ 35,000,000
Put option liability	15,614,000				15,614,000		$ 12,153,000
Put option
Commitments and Contingencies
Present value of put liability	$ 15,700,000			$ 50,700,000	$ 15,700,000
7.25% Series A preferred stock
Commitments and Contingencies
Preferred stock, shares issued (in shares) | shares	424,949			2,307,400	424,949		424,949
Preferred stock, fixed-to-floating rate cumulative redeemable				7.25%	7.25%		7.25%
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares	$ 25.00			$ 25.00	$ 25.00		$ 25.00
Preferred stock, discount (in percent)			2.00%			2.00%
5.00% Series B preferred stock
Commitments and Contingencies
Preferred stock, shares issued (in shares) | shares	1,135,590			2,892,600	1,135,590		1,135,590
Preferred stock, fixed-to-floating rate cumulative redeemable		5.00%		5.00%	5.00%		5.00%
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares	$ 25.00			$ 25.00	$ 25.00		$ 25.00
Preferred stock, discount (in percent)			2.00%			2.00%	2.50%
Preferred Stock
Commitments and Contingencies
Deferred issuance costs	$ 0		$ 2,500,000		$ 0	$ 2,500,000	$ 8,200,000
Preferred Stock | 7.25% Series A preferred stock
Commitments and Contingencies
Stock repurchased and retired during period, shares (in shares) | shares			768,519			768,519	1,882,451
Stock repurchased and retired during period			$ 24,500,000			$ 24,500,000
Stock repurchased and retired during period, average price per share (in dollars per share) | $ / shares			$ 24.50			$ 24.50
Preferred Stock | 5.00% Series B preferred stock
Commitments and Contingencies
Stock repurchased and retired during period, shares (in shares) | shares			231,481			231,481	1,757,010
Stock repurchased and retired during period			$ 24,500,000			$ 24,500,000	$ 88,700,000
Stock repurchased and retired during period, average price per share (in dollars per share) | $ / shares			$ 24.50			$ 24.50	$ 24.37
Nonperforming loans | Purchase commitment | One-to-four family residences
Commitments and Contingencies
Number of mortgage loans on real estate | loan					1
Aggregate unpaid principal balance of mortgage loans on real estate					$ 200,000