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EMPLOYEE BENEFIT PLANS - Additional information (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) Y | Dec. 31, 2023 USD ($) | Dec. 31, 2022 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 | 4.00% |  |  |  |
Percentage gain combined from other sources | 1.95% |  |  |  |
Defined contribution plan, employer matching contribution, percent of match | 2.00% |  |  |  | 6.00%
Defined contribution plan maximum annual contribution per union employee percent | 4.00% |  |  |  |
Non-elective contribution by employer for non union employees |  |  |  |  | 4.00%
Non-elective contribution by employer for union employees |  |  |  | 4.00% |
Defined contribution plan, cost | $ 982,000 |  | $ 900,000 |  |
Defined Contribution Plan assets in common stocks | $ 390,000 | $ 409,000 |  |  |
Period of investment performance | 20 years |  |  |  |
Other expense |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation plan expense | $ 19,000 | 23,000 |  |  |
Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, employer matching contribution, percent of match |  |  |  | 4.00% |
Employer matching | 1.00% |  |  |  | 3.00%
Other liabilities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation liability | $ 350,000 | 499,000 |  |  |
Equity securities | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 60.00% |  |  |  |
Equity securities | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |  |  |  |
Corporate bonds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Plan assets of the company's common stock | $ 1,800,000 | 2,000,000 |  |  |
Cash and cash equivalents | 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% |  |  |  |
Debt securities | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 100.00% |  |  |  |
Debt securities | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 0.00% |  |  |  |
Pension Plan |  |  |  |  |
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 | 4.00% |  |  |  |
Settlement charge | $ 471,000 | $ 0 |  |  |
Defined benefit plan percent of assets comprised of entity common stock | 2.80% | 3.40% |  |  |
Defined benefit plan, expected future employer contributions, next fiscal year | $ 0 |  |  |  |
Pension Plan | Other assets |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Assets for pension benefits | $ 31,400,000 | $ 24,700,000 |  |  |

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