Name:	af_LoansReceivableGrossCarryingAmount
Namespace Prefix:	af_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The aggregate gross carrying amount of interest-only loans held in portfolio, prior to deducting deferred income and the allowance for losses on loans which are scheduled to enter their amortization period more than thirty-six months from the balance sheet date.

No definition available.

Name:	af_LoansReceivableGrossCarryingAmountAmortizationScheduledMoreThanThirtySixMonths
Namespace Prefix:	af_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

Name:	af_LoansReceivableGrossCarryingAmountAmortizationScheduledMoreThanTwelveMonthsAndWithinTwentyFourMonths
Namespace Prefix:	af_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

Name:	af_LoansReceivableGrossCarryingAmountAmortizationScheduledMoreThanTwentyFourMonthsAndWithinThirtySixMonths
Namespace Prefix:	af_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The aggregate gross carrying amount of interest-only loans held in portfolio, prior to deducting deferred income and the allowance for losses on loans which are scheduled to enter their amortization period within twelve months or less from the balance sheet date.

No definition available.

Name:	af_LoansReceivableGrossCarryingAmountAmortizationScheduledWithinTwelveMonths
Namespace Prefix:	af_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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.

No definition available.

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

Recorded Investment in financing receivables that are past due at the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953401-111524