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.