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BORROWED FUNDS - Schedule of Borrowed Funds (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Borrowings and junior subordinated debentures
Principal, Short-term borrowings	$ 0	$ 0
Principal, Long-term borrowings	125,509	110,844
Total borrowings	$ 125,509	$ 110,844
Weighted average rate on short-term borrowings (as percent)	0.00%	0.00%
Weighted average rate on long-term borrowings (as percent)	5.52%	5.33%
Weighted Average Rate	5.52%	5.33%
Advances from the FHLBB
Borrowings and junior subordinated debentures
Principal, Short-term borrowings	$ 0	$ 0
Principal, Long-term borrowings	$ 4,445	$ 13,331
Weighted average rate on short-term borrowings (as percent)	0.00%	0.00%
Weighted average rate on long-term borrowings (as percent)	0.71%	1.75%
Subordinated notes
Borrowings and junior subordinated debentures
Principal, Long-term borrowings	$ 98,089	$ 74,590
Weighted average rate on long-term borrowings (as percent)	5.50%	7.00%
Junior subordinated borrowing - Trust I
Borrowings and junior subordinated debentures
Principal, Long-term borrowings	$ 15,464	$ 15,464
Weighted average rate on long-term borrowings (as percent)	6.54%	2.01%
Junior subordinated borrowing - Trust II
Borrowings and junior subordinated debentures
Principal, Long-term borrowings	$ 7,511	$ 7,459
Weighted average rate on long-term borrowings (as percent)	6.47%	1.90%

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