CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Allowance for credit losses	$ 16,230	$ 16,230	$ 7,188
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000	500,000,000
Common stock, shares issued (in shares)	226,760,148	226,760,148	231,824,192
Common stock, shares outstanding (in shares)	226,760,148	226,760,148	231,824,192
Series A Preferred Stock
Stockholders' Equity:
Preferred stock, dividend rate (percent)		8.00%	8.00%
Preferred stock, shares issued (in shares)	5,800,000	5,800,000	5,800,000
Preferred stock, shares outstanding (in shares)	5,800,000	5,800,000	5,800,000
Preferred Stock, liquidation preference	$ 145,000	$ 145,000	$ 145,000
Series B Preferred Stock
Stockholders' Equity:
Preferred stock, dividend rate (percent)	8.00%	8.00%	8.00%
Preferred stock, shares issued (in shares)	13,000,000	13,000,000	13,000,000
Preferred stock, shares outstanding (in shares)	13,000,000	13,000,000	13,000,000
Preferred Stock, liquidation preference	$ 325,000	$ 325,000	$ 325,000
Series C Preferred Stock
Stockholders' Equity:
Preferred stock, dividend rate (percent)	7.75%	7.75%	7.75%
Preferred stock, shares issued (in shares)	10,400,000	10,400,000	10,400,000
Preferred stock, shares outstanding (in shares)	10,400,000	10,400,000	10,400,000
Preferred Stock, liquidation preference	$ 260,000	$ 260,000	$ 260,000
Series D Preferred Stock
Stockholders' Equity:
Preferred stock, dividend rate (percent)	8.00%	8.00%	8.00%
Preferred stock, shares issued (in shares)	8,000,000	8,000,000	8,000,000
Preferred stock, shares outstanding (in shares)	8,000,000	8,000,000	8,000,000
Preferred Stock, liquidation preference	$ 200,000	$ 200,000	$ 200,000
Non-Agency RMBS
Allowance for credit losses	16,000	16,000	7,000
Non-Agency RMBS | Asset Pledged as Collateral | Securitized Loans
Liabilities:
MBS pledged as collateral at fair value on Secured financing agreements	250,000	250,000	276,000
Residential Mortgage-Backed Securities
Liabilities:
MBS pledged as collateral at fair value on Secured financing agreements	340,000	340,000	374,000
Residential Mortgage-Backed Securities | Asset Pledged as Collateral
Liabilities:
MBS pledged as collateral at fair value on Secured financing agreements	3,700,000	3,700,000	4,700,000
Loans Held for Investment at Fair Value | Asset Pledged as Collateral | Securitized Loans
Liabilities:
MBS pledged as collateral at fair value on Secured financing agreements	$ 11,000,000	$ 11,000,000	$ 10,000,000