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Stock Incentive Plans (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 27, 2015
Dec. 31, 2014
Stock Incentive Plans        
Stock-based compensation expense, net of taxes $ 995,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax $ 1,300,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax    
Stock-based compensation expense, taxes 614,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 712,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense    
Restricted common stock        
Stock Incentive Plans        
Granted (in shares) 26,232us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Granted (in dollars per share) $ 12.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Outstanding (in shares) 733,529us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
    752,701us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Performance-based restricted stock units        
Stock Incentive Plans        
Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
     
Granted (in dollars per share) $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
     
Outstanding (in shares) 744,200us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
    776,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
Restricted shares or units for which compensation cost will be excluded until the achievement of the performance conditions become probable 95,025af_EmployeeServiceShareBasedCompensationNonvestedPerformancebasedAwardsTotalCompensationCostNotYetRecognizedSharesOrUnits
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
     
Restricted common stock and restricted stock units        
Stock Incentive Plans        
Pre-tax compensation cost related to share-based compensation awards not yet recognized 9,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= af_RestrictedStockAndPerformanceBasedRestrictedStockUnitMember
     
Pre-tax compensation cost, weighted average recognition period 1 year 7 months 6 days      
Performance-based restricted common stock and performance-based restricted stock units        
Stock Incentive Plans        
Pre-tax compensation cost related to non-vested performance-based stock awards and units $ 1,700,000af_EmployeeServiceShareBasedCompensationNonvestedPerformancebasedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockAndPerformanceBasedRestrictedStockUnitMember
     
Performance-based restricted common stock        
Stock Incentive Plans        
Restricted shares or units for which compensation cost will be excluded until the achievement of the performance conditions become probable 65,000af_EmployeeServiceShareBasedCompensationNonvestedPerformancebasedAwardsTotalCompensationCostNotYetRecognizedSharesOrUnits
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockMember
     
Directors Stock Plan, 2007 Plan | Restricted common stock        
Stock Incentive Plans        
Granted (in shares) 26,232us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= af_DirectorsStockPlan2007PlanMember
     
Directors Stock Plan, 2007 Plan | Restricted common stock | Shares Vesting in February 2018        
Stock Incentive Plans        
Outstanding (in shares) 21,860us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= af_DirectorsStockPlan2007PlanMember
/ us-gaap_VestingAxis
= af_SharesVestinginFebruary2018Member
     
Vesting percentage 100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= af_DirectorsStockPlan2007PlanMember
/ us-gaap_VestingAxis
= af_SharesVestinginFebruary2018Member
     
Subsequent Event | Performance-based restricted stock units | Shares Vesting in February 2018        
Stock Incentive Plans        
Shares to be issued as a percentage of units granted in the event of change in control     100.00%af_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesToBeIssuedAsPercentageOfGrantedUponChangeInControl
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VestingAxis
= af_SharesVestinginFebruary2018Member
 
Subsequent Event | Employee Stock Plan, 2014 Plan | Restricted common stock        
Stock Incentive Plans        
Granted (in shares)     400,320us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= af_EmployeeStockPlan2014PlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Granted (in dollars per share)     13.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= af_EmployeeStockPlan2014PlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Vesting percentage     33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= af_EmployeeStockPlan2014PlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Subsequent Event | Employee Stock Plan, 2014 Plan | Performance-based restricted stock units        
Stock Incentive Plans        
Granted (in shares)     409,800us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
/ us-gaap_PlanNameAxis
= af_EmployeeStockPlan2014PlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Granted (in dollars per share)     12.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
/ us-gaap_PlanNameAxis
= af_EmployeeStockPlan2014PlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Share of common stock to be paid for each restricted stock unit     1af_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodShareOfCommonStockToBePaid
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
/ us-gaap_PlanNameAxis
= af_EmployeeStockPlan2014PlanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Minimum | Subsequent Event | Performance-based restricted stock units | Shares Vesting in February 2018        
Stock Incentive Plans        
Shares to be issued on vest date as percentage of units granted based on actual performance     0.00%af_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesToBeIssuedAsPercentageOfGranted
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VestingAxis
= af_SharesVestinginFebruary2018Member
 
Maximum | Subsequent Event | Performance-based restricted stock units | Shares Vesting in February 2018        
Stock Incentive Plans        
Shares to be issued on vest date as percentage of units granted based on actual performance     125.00%af_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSharesToBeIssuedAsPercentageOfGranted
/ us-gaap_AwardTypeAxis
= af_PerformanceBasedRestrictedStockUnitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_VestingAxis
= af_SharesVestinginFebruary2018Member