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Investment Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for Sale, Within one year, Amortized Cost $ 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Available for Sale, One to five years, Amortized Cost 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Available for Sale, Five to ten years, Amortized Cost 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Available for Sale, After ten years, Amortized Cost 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Total Available for Sale, by contractual maturity, Amortized Cost 0us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Available for Sale, Amortized Cost 47,941,000us-gaap_AvailableForSaleSecuritiesAmortizedCost 47,554,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for Sale, Within one year, Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Available for Sale, One to five years, Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Available for Sale, Five to ten years, Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Available for Sale, After ten years, Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total Available for Sale, by contractual maturity, Fair Value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Available for Sale, Fair Value 48,594,000us-gaap_AvailableForSaleSecurities 48,084,000us-gaap_AvailableForSaleSecurities
Held to Maturity Securities, Within one year, Amortized cost 359,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount  
Held to Maturity, One to five years, Amortized Cost 1,558,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount  
Held to Maturity, Five to ten years, Amortized Cost 2,260,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
Held to Maturity, After ten years, Amortized Cost 1,225,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
Total Held to Maturity, Amortized Cost 9,936,000us-gaap_HeldToMaturitySecurities 7,082,000us-gaap_HeldToMaturitySecurities
Held to Maturity Securities, Within one year, Fair Value 360,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
Held to Maturity, One to five years, Fair Value 1,563,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Held to Maturity, Five to ten years, Fair Value 2,266,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Held to Maturity, After ten years, Fair Value 1,230,000us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total Held to Maturity, Fair Value 9,997,000us-gaap_HeldToMaturitySecuritiesFairValue 7,110,000us-gaap_HeldToMaturitySecuritiesFairValue
Municipal Securities [Member]    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Total Held to Maturity, Amortized Cost 5,402,000us-gaap_HeldToMaturitySecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember		 2,346,000us-gaap_HeldToMaturitySecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
Total Held to Maturity, Fair Value 5,419,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember		 2,354,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_MunicipalNotesMember
GSE Mortgage-Backed Pass-Through Securities [Member]    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Total Held to Maturity, Amortized Cost 4,534,000us-gaap_HeldToMaturitySecurities
/ us-gaap_InvestmentTypeAxis
= asbi_GseMortgageBackedPassThroughSecuritiesMember		 4,736,000us-gaap_HeldToMaturitySecurities
/ us-gaap_InvestmentTypeAxis
= asbi_GseMortgageBackedPassThroughSecuritiesMember
Total Held to Maturity, Fair Value 4,578,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InvestmentTypeAxis
= asbi_GseMortgageBackedPassThroughSecuritiesMember		 4,756,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InvestmentTypeAxis
= asbi_GseMortgageBackedPassThroughSecuritiesMember
Ginnie Mae and GSE Mortgage-Backed Pass-Through Securities [Member]    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for Sale, Amortized Cost 44,129,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember		 43,675,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Available for Sale, Fair Value 44,739,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember		 44,198,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Ginnie Mae Collateralized Mortgage Obligations [Member]    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for Sale, Amortized Cost 1,976,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= asbi_GinnieMaeCollateralizedMortgageObligationsMember		 2,053,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= asbi_GinnieMaeCollateralizedMortgageObligationsMember
Available for Sale, Fair Value 1,961,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= asbi_GinnieMaeCollateralizedMortgageObligationsMember		 2,019,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= asbi_GinnieMaeCollateralizedMortgageObligationsMember
Mutual Fund [Member]    
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]    
Available for Sale, Amortized Cost 1,836,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= asbi_MutualFundMember		 1,826,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= asbi_MutualFundMember
Available for Sale, Fair Value $ 1,894,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= asbi_MutualFundMember		 $ 1,867,000us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= asbi_MutualFundMember