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