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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details) | 3 Months Ended | 12 Months Ended |  |
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Dec. 31, 2023 USD ($) security $ / shares | Dec. 31, 2023 USD ($) location lease item security $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Jan. 01, 2023 USD ($) | Dec. 31, 2020 USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |  |  |
Number of Stores | 17 | 17 |  |  |  |
Number of locations in Southwestern Pennsylvania Counties | item |  | 5 |  |  |  |
Assets under Management, Carrying Amount | $ 2,500,000,000 | $ 2,500,000,000 | $ 2,300,000,000 |  |  |
Number of locations in Pennsylvania | location |  | 16 |  |  |  |
Number of locations in state Maryland | location |  | 1 |  |  |  |
Held to maturity, allowance for credit losses | 37,000 | $ 37,000 |  |  | $ 114,000 |
Accrued interest receivable on held to maturity debt securities | 388,000 | 388,000 |  |  |  |
Held to maturity debt securities in non-accrual | 0 | 0 |  |  |  |
Allowance for credit losses | 926,000 | 926,000 |  |  |  |
Accrued interest receivable on available for sale debt securities | $ 988,000 | $ 988,000 |  |  |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued interest income receivable | Accrued interest income receivable |  |  |  |
Number of available for sale debt securities in non accrual status | security | 1 | 1 |  |  |  |
Available-for-Sale debt securities in non-accrual | $ 926,000 | $ 926,000 |  |  |  |
Federal Home Loan Bank Stock Par Value | $ / shares | $ 100 | $ 100 |  |  |  |
Accrued interest receivable | $ 4,200,000 | $ 4,200,000 | $ 3,500,000 |  |  |
Threshold Period Past Due for Write-off of Financing Receivable | 90 days | 90 days |  |  |  |
Description Of Accounting Treatment For Short Term Operating Lease |  | As of December 31, 2023, the Company had no short-term leases compared to one short-term lease for an office location as of December 31, 2022. |  |  |  |
Percentage of general reserve | 49.00% |  |  |  |  |
Percentage of quantitative reserve | 51.00% |  |  |  |  |
Evaluated for impairment | $ 150,000 | $ 150,000 |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  | 218,000 | 22,000 | 22,000 |  |
Income Taxes Paid |  | $ 625,000,000,000 | $ 1,100,000 | $ 200,000 |  |
Real Estate Owned, Transfer from Real Estate Owned |  | 15,000 | 53,000 | 8,000 |  |
Operating lease liabilities | 658,000 | 658,000 | 643,000 |  |  |
Operating lease right-of-use asset | 646,000 | 646,000 | 630,000 |  |  |
Finance Lease, Right-of-Use Asset | 2,384,000 | 2,384,000 | 2,413,000 |  |  |
Finance Lease, Liability | 2,700,000 | 2,700,000 | 2,680,000 |  |  |
Total interest payments |  | 21,771,000 | 8,450,000 | 8,049,000 |  |
Allowance for credit losses - Loans | 15,053,000 | 15,053,000 | 10,743,000 | $ 12,398,000 | 11,947,000 | $ 11,345,000
Allowance for credit losses | 940,000 | 940,000 | $ 746,000 |  | 923,000 |
Consumer and residential mortgage loans |  |  |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |  |  |
Minimum aggregate balances for commercial loan relationship under structure loan rating process. | $ 250,000 | $ 250,000 |  |  |  |
Core Deposits Intangibles |  |  |  |  |  |
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 | $ 3.18 | $ 3.18 | $ 4.00 | $ 4.00 |  |
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 | $ 4.22 |  |
Impact of adopting ASU 2016-13 |  |  |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |  |  |
Held to maturity, allowance for credit losses |  |  | $ 114,000 |  |  |
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 |  |  | 1,200,000 |
Allowance for credit losses |  |  |  |  | 177,000 |
ASU 2016-13 | Unfunded Loan Commitment |  |  |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |  |  |
Held to maturity, allowance for credit losses |  |  |  |  | 114,000 |
Allowance for credit losses | 177,000 | 177,000 |  |  |  |
ASU 2016-13 | Revision of Prior Period, Adjustment |  |  |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |  |  |
Held to maturity, allowance for credit losses |  |  |  |  | 114,000 |
Allowance for credit losses - Loans |  |  |  |  | 1,204,000 |
Allowance for credit losses |  |  |  |  | $ 177,000 |
ASU 2016-13 | Impact of adopting ASU 2016-13 |  |  |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |  |  |
Allowance for credit losses - Loans | (1,204,000) | (1,204,000) |  |  |  |
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 |  |  |  |
Commercial | Commercial |  |  |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |  |  |
Minimum aggregate balances for commercial loan relationship under structure loan rating process. | $ 1,000,000 | $ 1,000,000 |  |  |  |
Premises |  |  |  |  |  |
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 |  |  |  |
Finance Lease, Right-of-Use Asset |  |  | 45,000 |  |  |
Finance Lease, Liability | $ 248,000 | $ 248,000 | $ 45,000 |  |  |
Operating lease relating to office location |  |  |  |  |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |  |  |  |  |
Operating lease liabilities | 85,000 | 85,000 |  |  |  |
Operating lease right-of-use asset | $ 85,000 | $ 85,000 |  |  |  |

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