Schedule of Agency Securities Invests at Times in MBS not Issued or Guaranteed by U.S. Government Agency or U.S. Government Sponsored Entity (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Gross Unrealized Loss	$ (12,169)	$ (46,994)
Gross Unrealized Gain	142,143	143,490
Estimated Fair Value	12,045,571	14,302,230
Agency MBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	11,915,401	14,203,904
Gross Unrealized Loss	(11,510)	(45,164)
Gross Unrealized Gain	141,680	143,490
Estimated Fair Value	12,045,571	14,302,230
Fannie Mae Certificates \| Agency MBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	6,680,662	8,397,479
Gross Unrealized Loss	(4,469)	(22,613)
Gross Unrealized Gain	94,897	102,247
Estimated Fair Value	6,771,090	8,477,113
Fannie Mae Certificates \| Adjustable Rate Residential Mortgage \| Agency MBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	6,680,662	7,392,021
Gross Unrealized Loss	(4,469)	(14,465)
Gross Unrealized Gain	94,897	102,247
Estimated Fair Value	6,771,090	7,479,803
Fannie Mae Certificates \| Fixed-Rate \| Agency MBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		1,005,458
Gross Unrealized Loss		(8,148)
Estimated Fair Value		997,310
Freddie Mac Certificates \| Agency MBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	5,234,739	5,806,425
Gross Unrealized Loss	(7,041)	(22,551)
Gross Unrealized Gain	46,783	41,243
Estimated Fair Value	5,274,481	5,825,117
Freddie Mac Certificates \| Adjustable Rate Residential Mortgage \| Agency MBS
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	5,234,739	5,806,425
Gross Unrealized Loss	(7,041)	(22,551)
Gross Unrealized Gain	46,783	41,243
Estimated Fair Value	5,274,481	5,825,117
Agency CRT
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	111,217	111,217
Gross Unrealized Loss	(659)	(1,830)
Gross Unrealized Gain	463
Estimated Fair Value	$ 111,021	$ 109,387

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ 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 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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