Name:	anh_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAcquiredDuringPeriodAtAcquisitionWithoutDeteriorationOtherFairValue
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Period Type:	instant

Certain loans acquired in transfer accounted for as debt securities contractual principal not expected to be collected increase decrease.

No definition available.

Name:	anh_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesContractualPrincipalNotExpectedToBeCollectedIncreaseDecrease
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Certain loans acquired in transfer accounted for as debt securities contractually required principal increase decrease.

No definition available.

Name:	anh_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesContractuallyRequiredPrincipalIncreaseDecrease
Namespace Prefix:	anh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Certain loans acquired in transfer accounted for as debt securities expected cash flows to be collected increase decrease.

No definition available.

Name:	anh_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesExpectedCashFlowsToBeCollectedIncreaseDecrease
Namespace Prefix:	anh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Certain loans acquired in transfer accounted for as debt securities fair value adjustment.

No definition available.

Name:	anh_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesFairValueAdjustment
Namespace Prefix:	anh_
Data Type:	xbrli:monetaryItemType
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Certain loans acquired in transfer accounted for as debt securities fair value adjustment of other no credit deterioration.

No definition available.

Name:	anh_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesFairValueAdjustmentOfOtherNoCreditDeterioration
Namespace Prefix:	anh_
Data Type:	xbrli:monetaryItemType
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Certain loans acquired in transfer accounted for as debt securities market yield adjustment.

No definition available.

Name:	anh_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesMarketYieldAdjustment
Namespace Prefix:	anh_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Certain Loans Acquired In Transfer Accounted For As Debt Securities Unrealized (Loss) Gain, Net.

No definition available.

Name:	anh_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesUnrealizedLossGainNet
Namespace Prefix:	anh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Debt securities collateralized by first lien residential mortgage loans, issued by non-governmental sponsored enterprises.

No definition available.

Name:	anh_MortgageBackedSecuritiesIssuedByPrivateEntities
Namespace Prefix:	anh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

No definition available.

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

Name:	us-gaap_CertainLoansAcquiredInTransferAccountedForAsAvailableForSaleDebtSecuritiesAcquiredDuringPeriodAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Fair value at acquisition of acquired loans accounted for as available-for-sale debt securities with evidence of deterioration of credit quality.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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

Amount of contractually required payments receivable at acquisition of acquired loans accounted for as available-for-sale debt securities with evidence of deterioration of credit quality.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

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

The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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

Amount of increase (decrease) of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans accounted for as debt securities, with evidence of deterioration of credit quality.

Name:	us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

Amount of cash flows expected to be collected at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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

The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

No definition available.