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Loans Receivable and Allowance for Loan Losses (Loans Receivable and Related Allowance by Impairment Methodology) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Balances of our loans receivable and the related allowance for loan loss allocation by segment and by the impairment methodology followed in determining the allowance for loan losses        
Loans individually evaluated for impairment $ 246,803us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment $ 248,436us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment    
Loans collectively evaluated for impairment 11,529,037us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment 11,661,286us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment    
Total 11,775,840af_LoansReceivableGrossCarryingAmount 11,909,722af_LoansReceivableGrossCarryingAmount    
Loans individually evaluated for impairment, allowance for loan losses 20,723us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 19,732us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1    
Loans collectively evaluated for impairment, allowance for loan losses 89,777us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment 91,868us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment    
Total allowance for loan losses 110,500us-gaap_LoansAndLeasesReceivableAllowance 111,600us-gaap_LoansAndLeasesReceivableAllowance 134,000us-gaap_LoansAndLeasesReceivableAllowance 139,000us-gaap_LoansAndLeasesReceivableAllowance
Consumer and Other Loans        
Balances of our loans receivable and the related allowance for loan loss allocation by segment and by the impairment methodology followed in determining the allowance for loan losses        
Loans individually evaluated for impairment 6,504us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		 5,153us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		    
Loans collectively evaluated for impairment 246,581us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		 244,215us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		    
Total 253,085af_LoansReceivableGrossCarryingAmount
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		 249,368af_LoansReceivableGrossCarryingAmount
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		    
Loans individually evaluated for impairment, allowance for loan losses 4,938us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		 3,810us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		    
Loans collectively evaluated for impairment, allowance for loan losses 4,881us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		 5,015us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		    
Total allowance for loan losses 9,819us-gaap_LoansAndLeasesReceivableAllowance
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		 8,825us-gaap_LoansAndLeasesReceivableAllowance
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		 10,007us-gaap_LoansAndLeasesReceivableAllowance
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember		 8,824us-gaap_LoansAndLeasesReceivableAllowance
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_ConsumerAndOtherLoansMember
Mortgage loans (gross)        
Balances of our loans receivable and the related allowance for loan loss allocation by segment and by the impairment methodology followed in determining the allowance for loan losses        
Total 11,522,755af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		 11,660,354af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		    
Mortgage loans (gross) | Residential        
Balances of our loans receivable and the related allowance for loan loss allocation by segment and by the impairment methodology followed in determining the allowance for loan losses        
Loans individually evaluated for impairment 186,779us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		 181,402us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		    
Loans collectively evaluated for impairment 6,474,121us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		 6,692,134us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		    
Total 6,660,900af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		 6,873,536af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		    
Loans individually evaluated for impairment, allowance for loan losses 10,519us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		 10,304us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		    
Loans collectively evaluated for impairment, allowance for loan losses 32,962us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		 35,979us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		    
Total allowance for loan losses 43,481us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		 46,283us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		 74,717us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember		 80,337us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_ResidentialMortgageMember
Mortgage loans (gross) | Multi-family        
Balances of our loans receivable and the related allowance for loan loss allocation by segment and by the impairment methodology followed in determining the allowance for loan losses        
Loans individually evaluated for impairment 33,990us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		 42,611us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		    
Loans collectively evaluated for impairment 3,956,916us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		 3,870,442us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		    
Total 3,990,906af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		 3,913,053af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		    
Loans individually evaluated for impairment, allowance for loan losses 2,785us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		 3,172us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		    
Loans collectively evaluated for impairment, allowance for loan losses 37,297us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		 36,078us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		    
Total allowance for loan losses 40,082us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		 39,250us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		 34,578us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		 36,703us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
Mortgage loans (gross) | Commercial real estate        
Balances of our loans receivable and the related allowance for loan loss allocation by segment and by the impairment methodology followed in determining the allowance for loan losses        
Loans individually evaluated for impairment 19,530us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		 19,270us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		    
Loans collectively evaluated for impairment 851,419us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		 854,495us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		    
Total 870,949af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		 873,765af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		    
Loans individually evaluated for impairment, allowance for loan losses 2,481us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		 2,446us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		    
Loans collectively evaluated for impairment, allowance for loan losses 14,637us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		 14,796us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		    
Total allowance for loan losses $ 17,118us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		 $ 17,242us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		 $ 14,698us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		 $ 13,136us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember