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EMPLOYEE BENEFIT PLANS - Additional information (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 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% |  |  |  |
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 | $ 704,000 | $ 653,000 | $ 604,000 |  |
Defined Contribution Plan assets | $ 434,000 |  |  |  |
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 | $ 44,000 | 7,000 |  |  |
Other liabilities. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation liability | $ 526,000 | 443,000 |  |  |
Domestic equities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 60.00% |  |  |  |
Domestic equities | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 50.00% |  |  |  |
Domestic equities | 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 | $ 1,800,000 |  |  |  |
Debt Securities | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 40.00% |  |  |  |
Debt Securities | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 50.00% |  |  |  |
Defined Benefit Pension Items |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock | 10.00% |  |  |  |
Settlement charge | $ 1,736,000 |  |  |  |
Employer contributions | $ 8,000,000 | $ 9,000,000 |  |  |
Expected return on plan assets | 7.00% | 7.00% | 7.50% |  |
Defined benefit plan percent of assets comprised of entity common stock | 2.60% |  |  |  |
Defined Benefit Pension Items | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, expected future employer contributions, next fiscal year | $ 5,000,000.0 |  |  |  |
Defined Benefit Pension Items | Other assets. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Assets for pension benefits | 19,500,000 | $ 3,000,000.0 |  |  |
401(k) PLAN | Debt Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan assets of the company's common stock | $ 434,000 |  |  |  |

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