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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