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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details)
 3 Months Ended 12 Months Ended
Oct. 01, 2024
USD ($)
subsidiary
Dec. 31, 2024
USD ($)
location
security
$ / shares
Dec. 31, 2024
USD ($)
location
lease
segment
item
security
$ / shares
shares
Dec. 31, 2023
USD ($)
security
lease
$ / shares
shares
Dec. 31, 2022
USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Number of locations | location   16 16    
Number of locations in Southwestern Pennsylvania Counties | item     5    
Number of wholly owned subsidiaries | subsidiary 2        
Assets under Management, Carrying Amount   $ 2,600,000,000 $ 2,600,000,000 $ 2,500,000,000  
Number of locations in Pennsylvania | location     15    
Number of locations in state Maryland | location     1    
Number of reportable segments | segment     1    
Held to maturity, allowance for credit losses   89,000 $ 89,000 37,000  
Accrued interest receivable on held to maturity debt securities   403,000 403,000 388,000  
Held to maturity debt securities in non-accrual   0 0 0  
Allowance for credit losses   360,000 360,000 926,000  
Accrued interest receivable on available for sale debt securities   $ 833,000 $ 833,000 $ 988,000  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]   Interest Receivable Interest Receivable Interest Receivable  
Number of available for sale debt securities in non accrual status | security   1 1 1  
Available-for-Sale debt securities in non-accrual   $ 1,000,000 $ 1,000,000 $ 926,000  
Unpaid interest     $ 84,000 17,000  
Federal home loan bank stock par value | $ / shares   $ 100 $ 100    
Accrued interest receivable   $ 4,200,000 $ 4,200,000 $ 4,200,000  
Financing receivable, threshold period past due, writeoff   90 days 90 days    
Description of accounting treatment for short term operating lease     As of December 31, 2024 and 2023, the Company had no short-term leases. As of December 31, 2024 and 2023, the Company had no short-term leases.  
Percentage of general reserve   44.00%      
Percentage of quantitative reserve   56.00%      
Evaluated for impairment   $ 150,000 $ 150,000    
Antidilutive securities excluded from computation of earnings per share, amount | shares     194,000 218,000  
Income tax refund     $ 1,100,000    
Income tax payments       $ 625,000  
Total interest payments     30,800,000 21,800,000  
Real estate owned, transfer from real estate owned     1,900,000 15,000  
Operating lease right-of-use asset   1,550,000 1,550,000 646,000  
Operating lease liabilities   1,572,000 1,572,000 658,000  
Financing lease right-of-use asset   2,331,000 2,331,000 2,384,000  
Financing lease liabilities   2,689,000 $ 2,689,000 2,700,000  
Number of financing leases terminated | lease     2    
Finance lease right of use asset, write off     $ 141,000    
Finance lease liability, write off     141,000    
Allowance for credit losses - Loans   13,912,000 13,912,000 15,053,000 $ 10,743,000
Allowance for credit losses   $ 966,000 $ 966,000 $ 940,000  
AmeriServ Financial Bank | Financial Services Company          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Assets and capital transferred $ 6,500,000        
Core Deposits          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Finite-lived intangible asset useful life   10 years 10 years    
Minimum          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Share based compensation arrangement by share based payment award options exercisable price of anti dilutive option amount | $ / shares   $ 2.96 $ 2.96 $ 3.18  
Maximum          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Share based compensation arrangement by share based payment award options exercisable price of anti dilutive option amount | $ / shares   $ 4.22 $ 4.22 $ 4.22  
ASU 2016-13          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Held to maturity, allowance for credit losses   $ 114,000 $ 114,000    
Allowance for credit losses - Loans   1,200,000 1,200,000    
ASU 2016-13 | Unfunded Loan Commitment          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Allowance for credit losses   177,000 177,000    
U.S. Agency          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Held to maturity, allowance for credit losses   0 0    
U.S. Agency mortgage-backed securities          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Held to maturity, allowance for credit losses   $ 0 $ 0    
Building          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Property, plant and equipment, useful life   30 years 30 years    
Equipment          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Property, plant and equipment, useful life   10 years 10 years    
New finance leased assets          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Number of financing leases | lease     2 2  
Financing lease right-of-use asset   $ 298,000 $ 298,000 $ 248,000  
Financing lease liabilities   298,000 298,000 248,000  
Operating lease relating to office location          
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES          
Operating lease right-of-use asset   1,100,000 1,100,000 85,000  
Operating lease liabilities   $ 1,100,000 $ 1,100,000 $ 85,000