CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	300,000,000	300,000,000
Common stock, shares issued (shares)	187,779,489	187,739,634
Common stock, shares outstanding (shares)	187,779,489	187,739,634
Repurchase Agreements \| Residential Mortgage-Backed Securities
Securities pledged as collateral	$ 7,270,615,000	$ 7,033,866,000
Repurchase Agreements \| Non-agency MBS
Securities pledged as collateral	3,996,503,000	3,699,621,000
Variable Interest Entities, Primary Beneficiary, Aggregated Disclosure
Assets	14,693,307,000	10,761,954,000
Liabilities	10,451,235,000	7,300,163,000
Securitized Loans \| Non-agency MBS
Securities pledged as collateral	1,800,000,000	1,800,000,000
Securitized Loans \| Securitized Loans Held for Investment at Fair Value
Securities pledged as collateral	$ 12,700,000,000	$ 8,800,000,000
Preferred Class A
Preferred Stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (shares)	100,000,000	100,000,000
Preferred Stock, shares issued (shares)	5,800,000,000	5,800,000,000
Preferred Stock, shares outstanding (shares)	5,800,000,000	5,800,000,000
Preferred Stock, liquidation preference	$ 145,000	$ 145,000
Preferred Stock, dividend rate (percent)	8.00%	8.00%
Preferred Class B
Preferred Stock, par value (usd per share)	$ 0.01
Preferred Stock, shares authorized (shares)	100,000,000
Preferred Stock, shares issued (shares)	130,000,000
Preferred Stock, shares outstanding (shares)	0
Preferred Stock, liquidation preference	$ 325,000
Preferred Stock, dividend rate (percent)	8.00%

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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The percentage rate used to calculate dividend payments on preferred stock.

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No definition available.

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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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No definition available.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Fair value of financial instrument held by the entity for its own account (proprietary securities) for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

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The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5710-111685

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The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

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