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Borrowings (Details 7) (USD $)
12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 13, 2012
Sep. 30, 2012
May 10, 2013
Jun. 30, 2013
Jun. 19, 2012
Borrowings                
Prepayment charge $ 0us-gaap_GainsLossesOnExtinguishmentOfDebt $ 4,266,000us-gaap_GainsLossesOnExtinguishmentOfDebt $ 1,212,000us-gaap_GainsLossesOnExtinguishmentOfDebt          
Senior notes                
Borrowings                
Debt instrument, interest rate (as a percent)               5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior notes | 5.75% senior unsecured notes due 2012                
Borrowings                
Debt prepayment, aggregate principal amount       250,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= af_SeniorUnsecuredNotes5.75PercentDue2012Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Prepayment charge         1,200,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= af_SeniorUnsecuredNotes5.75PercentDue2012Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Senior notes | 5.00% senior unsecured notes due 2017                
Borrowings                
Aggregate principal amount               250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= af_SeniorUnsecuredNotes5.00PercentDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Debt instrument, interest rate (as a percent) 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= af_SeniorUnsecuredNotes5.00PercentDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
            5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= af_SeniorUnsecuredNotes5.00PercentDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Minimum notice requirement 30 days              
Other borrowings, net 248,700,000us-gaap_OtherLongTermDebt
/ us-gaap_DebtInstrumentAxis
= af_SeniorUnsecuredNotes5.00PercentDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
248,200,000us-gaap_OtherLongTermDebt
/ us-gaap_DebtInstrumentAxis
= af_SeniorUnsecuredNotes5.00PercentDue2017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
           
Reverse repurchase agreements                
Borrowings                
Securities pledged as collateral for repurchase agreements, Amortized Cost 1,260,000,000af_PledgedAssetsSeparatelyReportedSecuritiesPledgedForRepurchaseAgreementsAtAmortizedCost
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
1,260,000,000af_PledgedAssetsSeparatelyReportedSecuritiesPledgedForRepurchaseAgreementsAtAmortizedCost
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
           
Securities pledged as collateral for repurchase agreements, Fair Value 1,260,000,000af_PledgedAssetsSeparatelyReportedSecuritiesPledgedForRepurchaseAgreementsAtFairValueOne
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
1,240,000,000af_PledgedAssetsSeparatelyReportedSecuritiesPledgedForRepurchaseAgreementsAtFairValueOne
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
           
Reverse repurchase agreements | Minimum                
Borrowings                
Debt instrument, contractual maturities 4 years 5 years            
Reverse repurchase agreements | Maximum                
Borrowings                
Debt instrument, contractual maturities 10 years 10 years            
Junior subordinated debt                
Borrowings                
Aggregate principal amount           128,900,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
   
Debt instrument, interest rate (as a percent)           9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
   
Prepayment price for Junior Subordinated Debentures as a percentage of aggregate principal amount           103.413%af_DebtInstrumentPrepaymentPriceAsPercentageOfOutstandingPrincipalAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
   
Debt prepayment, aggregate principal amount           128,900,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
   
Prepayment charge             4,300,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember
 
Astoria Capital Trust I                
Borrowings                
Debt instrument, interest rate (as a percent)           9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
   
Capital Securities, aggregate liquidation amount           125,000,000af_CapitalSecurities
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
   
Common securities           $ 3,900,000af_UnconsolidatedSubsidiaryCommonStockValue
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember