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DERIVATIVE HEDGING INSTRUMENTS (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Derivative [Line Items]    
Maximum notional amount outstanding permitted   $ 500,000,000asrv_MaximumNotionalAmountOfDerivativesOutstanding
Interest Rate Swap [Member]    
Derivative [Line Items]    
Increase (decrease) in interest expense     
Interest Rate Swap One [Member]    
Derivative [Line Items]    
Start date Dec. 12, 2008  
Maturity date Sep. 24, 2013  
Notional amount 9,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= asrv_InterestRateSwapOneMember
 
Variable interest rate 5.25%us-gaap_DerivativeVariableInterestRate
/ us-gaap_DerivativeByNatureAxis
= asrv_InterestRateSwapOneMember
 
Fixed interest rate 2.73%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= asrv_InterestRateSwapOneMember
 
Increase (decrease) in interest expense 165,488us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1
/ us-gaap_DerivativeByNatureAxis
= asrv_InterestRateSwapOneMember
 
Interest Rate Swap Two [Member]    
Derivative [Line Items]    
Start date Dec. 12, 2008  
Maturity date Sep. 24, 2013  
Notional amount 9,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= asrv_InterestRateSwapTwoMember
 
Variable interest rate 2.73%us-gaap_DerivativeVariableInterestRate
/ us-gaap_DerivativeByNatureAxis
= asrv_InterestRateSwapTwoMember
 
Fixed interest rate 5.25%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeByNatureAxis
= asrv_InterestRateSwapTwoMember
 
Increase (decrease) in interest expense $ (165,488)us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1
/ us-gaap_DerivativeByNatureAxis
= asrv_InterestRateSwapTwoMember