Schedule of Agency Securities Portfolio Backed by U.S. Government Agency or U.S. Government Sponsored Entity (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	$ 16,427,272	$ 17,533,042
Gross Unrealized Loss	(43,653)	(120,019)
Gross Unrealized Gain	267,601	229,509
Carrying value/estimated fair value	16,651,220	17,642,532
Federal National Mortgage Association Certificates and Obligations (FNMA)
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	9,747,067	10,427,055
Gross Unrealized Loss	(17,277)	(46,669)
Gross Unrealized Gain	193,456	171,680
Carrying value/estimated fair value	9,923,246	10,552,066
Freddie Mac Certificates
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	6,680,205	7,009,751
Gross Unrealized Loss	(26,376)	(72,352)
Gross Unrealized Gain	74,145	57,829
Carrying value/estimated fair value	6,727,974	6,995,228
Government National Mortgage Association Certificates and Obligations (GNMA)
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost		96,236
Gross Unrealized Loss		(998)
Carrying value/estimated fair value		95,238
Fannie Mae Certificates, ARMs \| Federal National Mortgage Association Certificates and Obligations (FNMA)
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	9,458,568	9,620,743
Gross Unrealized Loss	(17,277)	(44,871)
Gross Unrealized Gain	189,611	167,848
Carrying value/estimated fair value	9,630,902	9,743,720
Fannie Mae Certificates, Fixed Rate \| Federal National Mortgage Association Certificates and Obligations (FNMA)
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	288,499	806,312
Gross Unrealized Loss	0	(1,798)
Gross Unrealized Gain	3,845	3,832
Carrying value/estimated fair value	292,344	808,346
Freddie Mac Certificates, ARMs \| Freddie Mac Certificates
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	6,514,037	6,671,013
Gross Unrealized Loss	(26,376)	(70,752)
Gross Unrealized Gain	72,439	57,808
Carrying value/estimated fair value	6,560,100	6,658,069
Freddie Mac Certificates, Fixed Rate \| Freddie Mac Certificates
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost	166,168	338,738
Gross Unrealized Loss	0	(1,600)
Gross Unrealized Gain	1,706	21
Carrying value/estimated fair value	167,874	337,159
Ginnie Mae Certificates, Fixed Rate \| Government National Mortgage Association Certificates and Obligations (GNMA)
Schedule Of Available For Sale Securities [Line Items]
Agency Securities Amortized Cost		96,236
Gross Unrealized Loss		(998)
Carrying value/estimated fair value		$ 95,238

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

No definition available.

+ Details

Name:	hts_AvailableForSaleSecuritiesGrossUnrealizedGainAccumulatedInInvestments
Namespace Prefix:	hts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

No definition available.

+ Details

Name:	hts_AvailableForSaleSecuritiesGrossUnrealizedLossAccumulatedInInvestments
Namespace Prefix:	hts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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=29643736&loc=d3e42546-110969

+ Details

Name:	us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration