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EMPLOYEE BENEFIT PLANS - Additional information (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) Y | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Minimum number of annual hours | 1,000 |  |  |  |
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock | 10.00% |  |  |  |
Period of investment performance | 20 years |  |  |  |
Percentage gain combined from other sources | 19.00% |  |  |  |
Defined contribution plan, employer matching contribution, percent of match | 2.00% |  |  |  | 6.00%
Non-elective contribution by employer for non union employees |  |  |  |  | 4.00%
Non-elective contribution by employer for union employees |  |  |  | 4.00% |
Defined contribution plan maximum annual contribution per union employee percent | 4.00% |  |  |  |
Defined contribution plan, cost | $ 808,000 | $ 704,000 | $ 653,000 |  |
Defined Contribution Plan assets in common stocks | $ 425,000 |  |  |  |
Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer matching | 1.00% |  |  |  | 3.00%
Defined contribution plan, employer matching contribution, percent of match |  |  |  | 4.00% |
Other expense |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation plan expense | $ 15,000 | 44,000 | $ 7,000 |  |
Other liabilities. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation liability | $ 502,000 | 526,000 |  |  |
Equity securities | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 0.00% |  |  |  |
Equity securities | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 60.00% |  |  |  |
Debt Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan assets of the company's common stock | $ 1,900,000 |  |  |  |
Debt Securities | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 0.00% |  |  |  |
Debt Securities | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 100.00% |  |  |  |
Cash and Cash Equivalents | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 0.00% |  |  |  |
Cash and Cash Equivalents | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 100.00% |  |  |  |
Defined Benefit Pension Items |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Requisite service period | 5 years |  |  |  |
Number of consecutive calendar years | Y | 5 |  |  |  |
Period of employment | 10 years |  |  |  |
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock | 10.00% |  |  |  |
Settlement charge | $ 2,498,000 | 1,736,000 |  |  |
Employer contributions | $ 4,000,000 | $ 8,000,000 |  |  |
Expected return on plan assets | 7.00% | 7.00% | 7.00% |  |
Defined benefit plan percent of assets comprised of entity common stock | 3.30% |  |  |  |
Charges for benefit obligation of defined benefit plan | $ 997,000 |  |  |  |
Percentage of charges for benefit obligation of defined benefit plan | 98.20% |  |  |  |
Defined Benefit Pension Items | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, expected future employer contributions, next fiscal year | $ 2,000,000.0 |  |  |  |
Defined Benefit Pension Items | Other assets. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Assets for pension benefits | 21,300,000 | $ 19,500,000 |  |  |
401(k) PLAN | Debt Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan assets of the company's common stock | $ 425,000 |  |  |  |

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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