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REGULATORY CAPITAL (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Summarized regulatory capital ratio of company
Tangible common equity ratio	7.56%us-gaap_TangibleCapitalToTangibleAssets	7.64%us-gaap_TangibleCapitalToTangibleAssets
Consolidated [Member]
Summarized regulatory capital ratio of company
Total Capital (To Risk Weighted Assets), Actual Amount	131,497us-gaap_Capital / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	128,469us-gaap_Capital / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total Capital (To Risk Weighted Assets), Actual Ratio	14.80%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	15.28%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total Capital (To Risk Weighted Assets), For Capital Adequacy Purposes Amount	71,066us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	67,247us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total Capital (To Risk Weighted Assets), For Capital Adequacy Purposes Ratio	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total Capital (To Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	88,833us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	84,059us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Total Capital (To Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Risk Weighted Assets), Actual Amount	120,992us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	117,957us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Risk Weighted Assets), Actual Ratio	13.62%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	14.03%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Risk Weighted Assets), For Capital Adequacy Purposes Amount	35,533us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	33,624us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Risk Weighted Assets), For Capital Adequacy Purposes Ratio	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	53,300us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	50,435us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Average Assets), Actual Amount	120,992us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	117,957us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Average Assets), Actual Ratio	11.34%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	11.45%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Average Assets), For Capital Adequacy Purposes Amount	42,662us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	41,204us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Average Assets), For Capital Adequacy Purposes Ratio	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	53,327us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	51,505us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
Tier 1 Capital (To Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntitiesMember
AmeriServ Financial Bank [Member]
Summarized regulatory capital ratio of company
Total Capital (To Risk Weighted Assets), Actual Amount	106,084us-gaap_Capital / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	103,009us-gaap_Capital / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Total Capital (To Risk Weighted Assets), Actual Ratio	12.07%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	12.39%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Total Capital (To Risk Weighted Assets), For Capital Adequacy Purposes Amount	70,305us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	66,506us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Total Capital (To Risk Weighted Assets), For Capital Adequacy Purposes Ratio	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Total Capital (To Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	87,881us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	83,132us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Total Capital (To Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Risk Weighted Assets), Actual Amount	95,579us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	92,611us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Risk Weighted Assets), Actual Ratio	10.88%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	11.14%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Risk Weighted Assets), For Capital Adequacy Purposes Amount	35,153us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	33,253us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Risk Weighted Assets), For Capital Adequacy Purposes Ratio	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	52,729us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	49,879us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Average Assets), Actual Amount	95,579us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	92,611us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Average Assets), Actual Ratio	9.19%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	9.23%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Average Assets), For Capital Adequacy Purposes Amount	41,608us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	40,124us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Average Assets), For Capital Adequacy Purposes Ratio	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	52,010us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	50,155us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember
Tier 1 Capital (To Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = asrv_AmeriservFinancialBankMember

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- Definition

The amount of total capital as defined in the regulations.

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The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Tangible Capital divided by Tangible assets as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Risk Based Capital as defined in the regulations.

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The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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