BORROWED FUNDS - Long-term Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Long-term Borrowing
Long-term borrowings	$ 148,824	$ 138,337
Loans maturing in 2024 with a weighted-average rate of 3.04%
Long-term Borrowing
Rate	3.04%	3.04%
Loans maturing in 2025 with a weighted-average rate of 4.30%
Long-term Borrowing
Rate	4.30%	4.30%
Loans maturing in 2026 with a weighted-average rate of 4.51%
Long-term Borrowing
Rate	4.51%	4.51%
Loans maturing in 2027 with a weighted-average rate of 4.00%
Long-term Borrowing
Rate	4.00%	4.00%
Loans maturing in 2028 with a weighted-average rate of 4.15%
Long-term Borrowing
Rate	4.15%	4.15%
Federal Home Loan Bank of Pittsburgh
Long-term Borrowing
Long-term borrowings	$ 148,824	$ 138,337
Federal Home Loan Bank of Pittsburgh | Loans maturing in 2024 with a weighted-average rate of 3.04%
Long-term Borrowing
Long-term borrowings	26,152	32,161
Federal Home Loan Bank of Pittsburgh | Loans maturing in 2025 with a weighted-average rate of 4.30%
Long-term Borrowing
Long-term borrowings	44,599	44,627
Federal Home Loan Bank of Pittsburgh | Loans maturing in 2026 with a weighted-average rate of 4.51%
Long-term Borrowing
Long-term borrowings	35,518	35,518
Federal Home Loan Bank of Pittsburgh | Loans maturing in 2027 with a weighted-average rate of 4.00%
Long-term Borrowing
Long-term borrowings	24,031	24,031
Federal Home Loan Bank of Pittsburgh | Loans maturing in 2028 with a weighted-average rate of 4.15%
Long-term Borrowing
Long-term borrowings	$ 18,524	$ 2,000