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Regulatory Matters (Narrative) (Details)
Dec. 31, 2014
Mar. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 risk based capital minimum capital percentage 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets  
Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 effective on January 1, 2015    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 risk-based capital minimum capital requirement percentage   4.50%af_CommonEquityTierOneRiskBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssets
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Tier 1 risk based capital minimum capital percentage   6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Total risk based capital minimum capital requirement percentage   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Tier 1 leverage minimum capital requirement percentage   4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Tier 1 leverage capital to be well capitalized percentage   5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets   6.50%af_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Tier 1 risk based capital to be well capitalized percentage   8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Total risk based capital to be well capitalized percentage   10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Astoria Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 risk-based capital minimum capital requirement percentage   4.50%af_CommonEquityTierOneRiskBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssets
/ dei_LegalEntityAxis
= af_AstoriaBankMember
Tier 1 risk based capital minimum capital percentage   6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= af_AstoriaBankMember
Total risk based capital minimum capital requirement percentage   8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= af_AstoriaBankMember
Tier 1 leverage minimum capital requirement percentage   4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= af_AstoriaBankMember
Tier 1 leverage capital to be well capitalized percentage   5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= af_AstoriaBankMember
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets   6.50%af_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= af_AstoriaBankMember
Tier 1 risk based capital to be well capitalized percentage   8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= af_AstoriaBankMember
Total risk based capital to be well capitalized percentage   10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= af_AstoriaBankMember
Minimum capital ratios including conservation buffer, January 1, 2019 | Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 effective on January 1, 2015    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 risk-based capital minimum capital requirement percentage   7.00%af_CommonEquityTierOneRiskBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssets
/ af_RequiredMinimumCapitalRatiosIncludingCapitalConservationBufferAxis
= af_RequiredMinimumCapitalRatiosIncludingCapitalConservationBufferFullyPhasedInBy1January2019Member
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Tier 1 risk based capital minimum capital percentage   8.50%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ af_RequiredMinimumCapitalRatiosIncludingCapitalConservationBufferAxis
= af_RequiredMinimumCapitalRatiosIncludingCapitalConservationBufferFullyPhasedInBy1January2019Member
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Total risk based capital minimum capital requirement percentage   10.50%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ af_RequiredMinimumCapitalRatiosIncludingCapitalConservationBufferAxis
= af_RequiredMinimumCapitalRatiosIncludingCapitalConservationBufferFullyPhasedInBy1January2019Member
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
Required minimum conservation buffer percentage   2.50%af_MinimumConservationBufferPercentage
/ af_RequiredMinimumCapitalRatiosIncludingCapitalConservationBufferAxis
= af_RequiredMinimumCapitalRatiosIncludingCapitalConservationBufferFullyPhasedInBy1January2019Member
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
On January 1, 2016 | Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 effective on January 1, 2015    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Required minimum conservation buffer percentage   0.625%af_MinimumConservationBufferPercentage
/ af_PhasingOfCapitalConservationBufferAxis
= af_RequiredMinimumConservationBufferToBePhasedOn1January2016Member
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
On January 1, 2017 | Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 effective on January 1, 2015    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Required minimum conservation buffer percentage   1.25%af_MinimumConservationBufferPercentage
/ af_PhasingOfCapitalConservationBufferAxis
= af_RequiredMinimumConservationBufferToBePhasedOn1January2017Member
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member
On January 1, 2018 | Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 effective on January 1, 2015    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Required minimum conservation buffer percentage   1.875%af_MinimumConservationBufferPercentage
/ af_PhasingOfCapitalConservationBufferAxis
= af_RequiredMinimumConservationBufferToBePhasedOn1January2018Member
/ us-gaap_StatementScenarioAxis
= af_DoddFrankWallStreetReformAndConsumerProtectionActOf2010EffectiveOn1January2015Member