REVENUE RECOGNITION (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Wealth management fees									$ 9,659	$ 9,170	$ 8,747
Service charges on deposit accounts									1,420	1,581	1,674
Other									1,720	1,665	1,642
Non-interest income (in-scope of topic 606)									12,799	12,416	12,063
Non-interest income (out-of-scope of topic 606)									1,425	2,229	2,575
Total non-interest income	$ 3,322	$ 3,586	$ 3,681	$ 3,635	$ 3,699	$ 3,629	$ 3,755	$ 3,562	$ 14,224	$ 14,645	$ 14,638

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 nontransaction 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.

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