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BORROWED FUNDS - Short-term borrowings - Additional information (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
BORROWED FUNDS
Short-term borrowings	$ 23,253,000	$ 80,062,000
Other assets
BORROWED FUNDS
Federal Home Loan Bank Stock	6,243,000
Other Correspondent Banks
BORROWED FUNDS
Line of Credit Facility, Maximum Borrowing Capacity	95,000,000	95,000,000
Long-term Line of Credit, Total	0	0
Federal Reserve Bank of Philadelphia | Collateral Pledged
BORROWED FUNDS
Investment pledged as collateral	$ 21,731,000	$ 24,113,000
Customer repurchase agreements
BORROWED FUNDS
Debt, Weighted Average Interest Rate	0.10%	0.10%
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned, Total	$ 1,770,000	$ 3,080,000
Short-term borrowings	1,753,000	3,062,000
FHLB-Pittsburgh borrowings
BORROWED FUNDS
Short-term borrowings	21,500,000	77,000,000
Federal Home Loan Bank of Pittsburgh
BORROWED FUNDS
Line of Credit Facility, Maximum Borrowing Capacity	918,798,000	839,378,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	1,321,417,000	1,209,179,000
Line of Credit Facility, Remaining Borrowing Capacity	752,847,000	689,279,000
Short-term advances		0
Federal Home Loan Bank of Pittsburgh | Other assets
BORROWED FUNDS
Federal Home Loan Bank Stock	14,570,000	14,168,000
Federal Home Loan Bank of Pittsburgh | Federal Reserve Bank of Philadelphia
BORROWED FUNDS
Line of Credit Facility, Maximum Borrowing Capacity	20,766,000	23,107,000
Long-term Line of Credit, Total	$ 0	$ 0
Federal Home Loan Bank of Pittsburgh | Overnight Borrowing
BORROWED FUNDS
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	5.68%	4.45%
Short-term borrowings	$ 6,500,000	$ 77,000,000
Federal Home Loan Bank of Pittsburgh | FHLB-Pittsburgh borrowings
BORROWED FUNDS
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate	5.61%
Short-term borrowings	$ 15,000,000

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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