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EMPLOYEE BENEFIT PLANS - Additional information (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
Y
Dec. 31, 2022
USD ($)
Dec. 31, 2021
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 0.49%        
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 $ 900,000 $ 808,000 $ 704,000    
Defined Contribution Plan assets in common stocks $ 409,000        
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 $ 23,000 15,000 $ 44,000    
Other liabilities.          
Defined Benefit Plan Disclosure [Line Items]          
Deferred compensation liability $ 499,000 502,000      
Domestic securities | Minimum          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, plan assets, target allocation, percentage 0.00%        
Domestic 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 $ 2,000,000.0        
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%        
Employer contributions   $ 4,000,000      
Expected return on plan assets 7.00% 7.00% 7.00%    
Defined benefit plan percent of assets comprised of entity common stock 3.40%        
Defined Benefit Pension Items | Minimum          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, expected future employer contributions, next fiscal year $ 0        
Defined Benefit Pension Items | Other assets.          
Defined Benefit Plan Disclosure [Line Items]          
Assets for pension benefits 24,700,000 $ 21,300,000      
401(k) PLAN | Debt Securities          
Defined Benefit Plan Disclosure [Line Items]          
Plan assets of the company's common stock $ 409,000