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EMPLOYEE BENEFIT PLANS - Additional information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | 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 maximum annual contribution per union employee percent | 4.00% |  |  |  |
Defined contribution plan, employer matching contribution, percent of match |  |  |  | 6.00% | 2.00%
Defined contribution plan, maximum annual contributions per employee, percent |  |  |  | 3.00% | 1.00%
Defined contribution plan, cost | $ 604,000 | $ 503,000 | $ 469,000 |  |
Defined benefit plan, expected amortization of gain (loss), next fiscal year | 2,499,000 |  |  |  |
Other expense |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation plan expense | 9,000 |  |  |  |
Other liabilities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Deferred compensation liability | $ 366,000 |  |  |  |
Domestic equities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 60.00% |  |  |  |
Domestic equities [Member] | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 50.00% |  |  |  |
Domestic equities [Member] | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 60.00% |  |  |  |
Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Employer, Related Party, Amount | $ 1,300,000 |  |  |  |
Debt Securities [Member] | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 40.00% |  |  |  |
Debt Securities [Member] | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage | 50.00% |  |  |  |
Defined Benefit Pension Items [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock | 10.00% |  |  |  |
Expected return on plan assets | 7.50% | 7.50% | 7.75% |  |
Defined benefit plan percent of assets comprised of entity common stock | 2.80% |  |  |  |
Defined benefit plan, expected future employer contributions, next fiscal year | $ 4,000,000 |  |  |  |
401(k) PLAN | Debt Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Plan Assets, Employer, Related Party, Amount | $ 924,000 |  |  |  |

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