SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2025 USD ($) security location $ / shares	Dec. 31, 2025 USD ($) item security location segment $ / shares shares	Dec. 31, 2024 USD ($) lease security $ / shares shares	Dec. 31, 2023 USD ($)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number of locations | location	16	16
Number of locations in southwestern Pennsylvania counties | item		5
Number of locations in Pennsylvania | location		15
Number of locations in state Maryland | location		1
Financial services and administers assets	$ 2,700,000,000	$ 2,700,000,000	$ 2,600,000,000
Number of reportable segments | segment		1
Investment trading account	7,000,000	$ 7,000,000
Cash held in the account available for future security purchases	99,000	99,000
Held to maturity, allowance for credit losses	90,000	90,000	89,000	$ 37,000
Accrued interest receivable on held to maturity debt securities	384,000	384,000	403,000
Held to maturity debt securities in non-accrual	0	0	0
Allowance for credit losses	0	0	360,000	$ 926,000
Accrued interest receivable on available for sale debt securities	$ 977,000	$ 977,000	$ 833,000
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	0	0	1
Available-for-Sale debt securities in non-accrual	$ 1,000,000	$ 1,000,000	$ 1
Unpaid interest			84,000
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, 2025 and 2024, the Company had no short-term leases.	As of December 31, 2025 and 2024, the Company had no short-term leases.
Percentage of general reserve	41.00%
Percentage of quantitative reserve	59.00%
Evaluated for impairment	$ 150,000	$ 150,000
Antidilutive securities excluded from computation of earnings per share, amount | shares		166,000	194,000
Income tax payments		$ 325,000
Income tax refund			$ 1,100,000
Total interest payments		28,500,000	30,800,000
Real estate owned, transfer from real estate owned		49,000	1,900,000
Operating lease right-of-use asset	1,395,000	1,395,000	1,550,000
Operating lease liabilities	1,426,000	1,426,000	1,572,000
Financing lease right-of-use asset	2,106,000	2,106,000	2,331,000
Financing lease liabilities	$ 2,501,000	$ 2,501,000	$ 2,689,000
Number of financing leases terminated | lease			2
Finance lease right of use asset, write off			$ 141,000
Finance lease liability, write off			$ 141,000
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	$ 2.96
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
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 | Maximum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Property, plant and equipment, useful life	30 years	30 years
Equipment | Maximum
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
Financing lease right-of-use asset			$ 298,000
Financing lease liabilities			298,000
Operating lease relating to office location
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Operating lease right-of-use asset	$ 32,000	$ 32,000	1,100,000
Operating lease liabilities	$ 32,000	$ 32,000	$ 1,100,000