BORROWINGS (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Repurchase Agreements	$ 210,140	$ 196,451
Total short-term borrowings	470,140	265,176
Subordinated Debt	44,331	44,331
Short-term Debt [Member]
Debt Instrument [Line Items]
Repurchase Agreements	210,140	196,451
Short-Term Bank Loans and Notes Payable	135,000	0
FHLBB and Correspondent Bank Overnight Borrowings	0	18,725
Federal Home Loan Bank, Advance, Maturity, Year One	125,000	$ 50,000
Short-term Debt [Member] | Bank Term Funding Program
Debt Instrument [Line Items]
Face amount	$ 135,000
Interest rate	4.70%