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Deposits (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Weighted Average Rate:    
Savings (as a percent) 0.05%us-gaap_WeightedAverageRateDomesticDepositSavings 0.05%us-gaap_WeightedAverageRateDomesticDepositSavings
Money market (as a percent) 0.24%us-gaap_WeightedAverageRateDomesticDepositMoneyMarket 0.25%us-gaap_WeightedAverageRateDomesticDepositMoneyMarket
NOW (as a percent) 0.06%af_WeightedAverageRateDomesticDepositNegotiableOrderOfWithdrawalNow 0.06%af_WeightedAverageRateDomesticDepositNegotiableOrderOfWithdrawalNow
Total core deposits (as a percent) 0.11%af_WeightedAverageRateDomesticCoreDeposit 0.11%af_WeightedAverageRateDomesticCoreDeposit
Certificates of deposit (as a percent) 1.47%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit 1.50%us-gaap_WeightedAverageRateDomesticDepositCertificatesOfDeposit
Total deposits (as a percent) 0.50%us-gaap_WeightedAverageRateDomesticDeposit 0.57%us-gaap_WeightedAverageRateDomesticDeposit
Balance:    
Savings $ 2,237,142us-gaap_DepositsSavingsDeposits $ 2,493,899us-gaap_DepositsSavingsDeposits
Money market 2,373,484us-gaap_DepositsMoneyMarketDeposits 1,972,136us-gaap_DepositsMoneyMarketDeposits
NOW 1,331,345us-gaap_DepositsNegotiableOrderOfWithdrawalNOW 1,231,890us-gaap_DepositsNegotiableOrderOfWithdrawalNOW
Non-interest bearing NOW and demand deposit 867,432us-gaap_NoninterestBearingDepositLiabilities 865,588us-gaap_NoninterestBearingDepositLiabilities
Total core deposits 6,809,403af_CoreDeposits 6,563,513af_CoreDeposits
Certificates of deposit 2,695,506us-gaap_TimeDeposits 3,291,797us-gaap_TimeDeposits
Total deposits $ 9,504,909us-gaap_Deposits $ 9,855,310us-gaap_Deposits
Percent of Total:    
Savings (as a percent) 23.54%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsSavings 25.31%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsSavings
Money market (as a percent) 24.96%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket 20.01%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsMoneyMarket
NOW (as a percent) 14.01%af_PercentageOfInterestBearingDomesticDepositsToDepositsNegotiableOrderOfWithdrawal 12.50%af_PercentageOfInterestBearingDomesticDepositsToDepositsNegotiableOrderOfWithdrawal
Non-interest bearing NOW and demand deposit (as a percent) 9.13%af_PercentageOfNonInterestBearingDepositsToTotalDeposits 8.78%af_PercentageOfNonInterestBearingDepositsToTotalDeposits
Total core deposits (as a percent) 71.64%af_PercentageOfCoreDepositsToTotalDeposits 66.60%af_PercentageOfCoreDepositsToTotalDeposits
Certificates of deposit (as a percent) 28.36%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsTimeDeposits 33.40%us-gaap_PercentageOfInterestBearingDomesticDepositsToDepositsTimeDeposits
Total deposits (as a percent) 100.00%af_PercentageOfDepositsToDepositsTotal 100.00%af_PercentageOfDepositsToDepositsTotal