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 within one year from the balance sheet date.

No definition available.

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

No definition available.

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

No definition available.

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

No definition available.

Name:	af_LoansReceivableGrossCarryingAmountAmortizationScheduledWithinTwoYears
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.