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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 |

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