CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	100,000,000	100,000,000
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	500,000,000	300,000,000
Common stock, shares issued (shares)	187,226,081	187,052,398
Common stock, shares outstanding (shares)	187,226,081	187,052,398
Repurchase Agreements
Securities pledged as collateral	$ 15,399,244,000	$ 15,831,007,000
Repurchase Agreements \| Residential Mortgage-Backed Securities
Securities pledged as collateral	15,400,000,000	15,800,000,000
Securitized Loans \| Non-Agency RMBS
Securities pledged as collateral	598,000,000	1,000,000,000
Securitized Loans \| Loans Held for Investment at Fair Value
Securities pledged as collateral	$ 12,100,000,000	$ 12,300,000,000
Series A Preferred Stock
Preferred stock, dividend rate (percent)	8.00%	8.00%
Preferred stock, shares issued (shares)	5,800,000	5,800,000
Preferred stock, shares outstanding (shares)	5,800,000	5,800,000
Preferred Stock, liquidation preference	$ 145,000	$ 145,000
Series B Preferred Stock
Preferred stock, dividend rate (percent)	8.00%	8.00%
Preferred stock, shares issued (shares)	13,000,000	13,000,000
Preferred stock, shares outstanding (shares)	13,000,000	13,000,000
Preferred Stock, liquidation preference	$ 325,000	$ 325,000
Series C Preferred Stock
Preferred stock, dividend rate (percent)	7.75%	7.75%
Preferred stock, shares issued (shares)	10,400,000	10,400,000
Preferred stock, shares outstanding (shares)	10,400,000	10,400,000
Preferred Stock, liquidation preference	$ 260,000	$ 260,000
Series D Preferred Stock
Preferred stock, dividend rate (percent)	8.00%	8.00%
Preferred stock, shares issued (shares)	8,000,000	0
Preferred stock, shares outstanding (shares)	8,000,000	0
Preferred Stock, liquidation preference	$ 200,000	$ 200,000
Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure
Assets	12,544,744,000	13,392,951,000
Liabilities	$ 8,064,235,000	$ 8,652,158,000

Face amount or stated value per share of common stock.

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