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Earnings Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net income $ 19,307us-gaap_NetIncomeLoss $ 31,549us-gaap_NetIncomeLoss
Preferred stock dividends (2,194)us-gaap_PreferredStockDividendsIncomeStatementImpact (2,194)us-gaap_PreferredStockDividendsIncomeStatementImpact
Net income available to common shareholders 17,113us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 29,355us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Income allocated to participating securities (114)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic (312)us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Net income allocated to common shareholders $ 16,999af_NetIncomeLossAllocatedToCommonStockholdersBasic $ 29,043af_NetIncomeLossAllocatedToCommonStockholdersBasic
Basic weighted average common shares outstanding 99,252,031us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 98,106,045us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options and restricted stock units 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted average common shares outstanding 99,252,031us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 98,106,045us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic EPS $ 0.17us-gaap_EarningsPerShareBasic $ 0.30us-gaap_EarningsPerShareBasic
Diluted EPS $ 0.17us-gaap_EarningsPerShareDiluted $ 0.30us-gaap_EarningsPerShareDiluted
Options    
Antidilutive securities excluded from computation of earnings per share    
Stock options excluded from computation of earnings per share (in shares) 20,667us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= af_EmployeeNonEmployeeDirectorStockOptionMember
1,050,083us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= af_EmployeeNonEmployeeDirectorStockOptionMember
Restricted stock units (RSUs)    
Antidilutive securities excluded from computation of earnings per share    
Restricted stock units excluded from the computation of earning per share (in shares) 762,038af_RestrictedStockUnitsExcludedFromComputationOfEarningPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
659,837af_RestrictedStockUnitsExcludedFromComputationOfEarningPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember