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EMPLOYEE BENEFIT PLANS - Additional information (Details)
 12 Months Ended
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