Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from non-transaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early with

No definition available.

Name:	asrv_FeesAndCommissionsDepositorAccount
Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
REVENUE RECOGNITION
Wealth management fees									$ 9,730	$ 9,659	$ 9,170
Service charges on deposit accounts									1,271	1,420	1,581
Other									1,759	1,720	1,665
Non-interest income (in-scope of topic 606)									12,760	12,799	12,416
Non-interest income (out-of-scope of topic 606)									2,013	1,425	2,229
Total Non-Interest Income	$ 3,416	$ 4,095	$ 3,657	$ 3,605	$ 3,322	$ 3,586	$ 3,681	$ 3,635	$ 14,773	$ 14,224	$ 14,645