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Segment Results (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Contribution of segments to the consolidated results of operations
Total revenue	$ 12,646us-gaap_InterestRevenueExpenseNet	$ 12,057us-gaap_InterestRevenueExpenseNet
Net income	1,369us-gaap_NetIncomeLoss	930us-gaap_NetIncomeLoss
Total assets	1,103,416us-gaap_Assets		1,089,263us-gaap_Assets
Retail Banking [Member]
Contribution of segments to the consolidated results of operations
Total revenue	6,524us-gaap_InterestRevenueExpenseNet / us-gaap_StatementBusinessSegmentsAxis = asrv_RetailBankingMember	6,117us-gaap_InterestRevenueExpenseNet / us-gaap_StatementBusinessSegmentsAxis = asrv_RetailBankingMember
Net income	659us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asrv_RetailBankingMember	348us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asrv_RetailBankingMember
Total assets	374,490us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = asrv_RetailBankingMember		376,009us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = asrv_RetailBankingMember
Commercial Banking [Member]
Contribution of segments to the consolidated results of operations
Total revenue	4,738us-gaap_InterestRevenueExpenseNet / us-gaap_StatementBusinessSegmentsAxis = asrv_CommercialBankingMember	4,327us-gaap_InterestRevenueExpenseNet / us-gaap_StatementBusinessSegmentsAxis = asrv_CommercialBankingMember
Net income	1,291us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asrv_CommercialBankingMember	1,096us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asrv_CommercialBankingMember
Total assets	586,916us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = asrv_CommercialBankingMember		563,690us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = asrv_CommercialBankingMember
Trust [Member]
Contribution of segments to the consolidated results of operations
Total revenue	2,167us-gaap_InterestRevenueExpenseNet / us-gaap_StatementBusinessSegmentsAxis = asrv_TrustMember	2,114us-gaap_InterestRevenueExpenseNet / us-gaap_StatementBusinessSegmentsAxis = asrv_TrustMember
Net income	380us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asrv_TrustMember	308us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asrv_TrustMember
Total assets	5,125us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = asrv_TrustMember		5,015us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = asrv_TrustMember
Investment/ Parent [Member]
Contribution of segments to the consolidated results of operations
Total revenue	(783)us-gaap_InterestRevenueExpenseNet / us-gaap_StatementBusinessSegmentsAxis = asrv_InvestmentOrParentMember	(501)us-gaap_InterestRevenueExpenseNet / us-gaap_StatementBusinessSegmentsAxis = asrv_InvestmentOrParentMember
Net income	(961)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asrv_InvestmentOrParentMember	(822)us-gaap_NetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asrv_InvestmentOrParentMember
Total assets	$ 136,885us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = asrv_InvestmentOrParentMember		$ 144,549us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = asrv_InvestmentOrParentMember

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