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Loans Receivable and Allowance for Loan Losses (Details 6) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total $ 11,909,722af_LoansReceivableGrossCarryingAmount $ 12,386,378af_LoansReceivableGrossCarryingAmount
Mortgage loans (gross)    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 11,660,354af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember		 12,146,697af_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 3,913,053af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember		 3,296,455af_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 3,850,068af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= af_NotCriticizedMember		 3,209,786af_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 30,975af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 14,063af_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 31,264af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= af_MultiFamilyMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 72,606af_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 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 873,765af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember		 812,966af_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 817,404af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= af_NotCriticizedMember		 759,114af_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 22,584af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 9,760af_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 32,664af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 44,092af_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 $ 1,113af_LoansReceivableGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ af_FinancingReceivablesInformationByPortfolioSegmentAxis
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= us-gaap_DoubtfulMember