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	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost		$ 17,354,770
Gross Unrealized Loss	$ (46,994)	(35,531)
Gross Unrealized Gain	143,490	267,771
Carrying value/estimated fair value	14,302,230	17,587,010
Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	14,203,904	17,279,316
Gross Unrealized Loss	(45,164)	(35,531)
Gross Unrealized Gain	143,490	267,623
Carrying value/estimated fair value	14,302,230	17,511,408
Adjustable Rate Residential Mortgage
Schedule Of Available For Sale Securities [Line Items]
Carrying value/estimated fair value	13,414,307	16,310,376
Adjustable Rate Residential Mortgage \| Non-Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost		75,454
Gross Unrealized Gain		148
Carrying value/estimated fair value		75,602
Fixed-Rate
Schedule Of Available For Sale Securities [Line Items]
Carrying value/estimated fair value	997,310	1,276,634
Fannie Mae Certificates \| Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	8,397,479	10,315,029
Gross Unrealized Loss	(22,613)	(13,737)
Gross Unrealized Gain	102,247	189,066
Carrying value/estimated fair value	8,477,113	10,490,358
Fannie Mae Certificates \| Adjustable Rate Residential Mortgage \| Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	7,392,021	9,203,741
Gross Unrealized Loss	(14,465)	(13,737)
Gross Unrealized Gain	102,247	183,889
Carrying value/estimated fair value	7,479,803	9,373,893
Fannie Mae Certificates \| Fixed-Rate \| Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	1,005,458	1,111,288
Gross Unrealized Loss	(8,148)
Gross Unrealized Gain		5,177
Carrying value/estimated fair value	997,310	1,116,465
Freddie Mac Certificates \| Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	5,806,425	6,964,287
Gross Unrealized Loss	(22,551)	(21,794)
Gross Unrealized Gain	41,243	78,557
Carrying value/estimated fair value	5,825,117	7,021,050
Freddie Mac Certificates \| Adjustable Rate Residential Mortgage \| Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	5,806,425	6,805,885
Gross Unrealized Loss	(22,551)	(21,794)
Gross Unrealized Gain	41,243	76,790
Carrying value/estimated fair value	5,825,117	6,860,881
Freddie Mac Certificates \| Fixed-Rate \| Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost		158,402
Gross Unrealized Gain		1,767
Carrying value/estimated fair value		$ 160,169
Agency CRT
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	111,217
Gross Unrealized Loss	(1,830)
Carrying value/estimated fair value	$ 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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