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Loans Receivable and Allowance for Loan Losses (Multi-Family and Commercial Real Estate Loans, by Credit Quality Indicator) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total $ 11,775,840af_LoansReceivableGrossCarryingAmount $ 11,909,722af_LoansReceivableGrossCarryingAmount
Mortgage loans (gross)    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 11,522,755af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		 11,660,354af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
Mortgage loans (gross) | Multi-family    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
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
Mortgage loans (gross) | Multi-family | Not criticized    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 3,917,675af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= af_NotCriticizedMember		 3,850,068af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= af_NotCriticizedMember
Mortgage loans (gross) | Multi-family | Special mention    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 43,832af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 30,975af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Mortgage loans (gross) | Multi-family | Substandard    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 28,660af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 31,264af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage loans (gross) | Multi-family | Doubtful    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 739af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 746af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Mortgage loans (gross) | Commercial real estate    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
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
Mortgage loans (gross) | Commercial real estate | Not criticized    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 814,941af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= af_NotCriticizedMember		 817,404af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= af_NotCriticizedMember
Mortgage loans (gross) | Commercial real estate | Special mention    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 21,443af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 22,584af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Mortgage loans (gross) | Commercial real estate | Substandard    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 33,461af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 32,664af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Mortgage loans (gross) | Commercial real estate | Doubtful    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total $ 1,104af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 $ 1,113af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
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/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember