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BORROWINGS - Others (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Borrowed funds
Carrying value of the loans pledged as collateral	$ 4,771,710	$ 4,796,398
FRB
Borrowed funds
Maximum borrowing capacity	629,400
Other Loans
Borrowed funds
Maximum borrowing capacity	25,000
Securities \| FRB
Borrowed funds
Securities pledged as collateral	267,300
Asset Pledged as Collateral \| Federal Reserve Bank of Boston
Borrowed funds
Available borrowing capacity	762,000
Asset Pledged as Collateral \| Federal Reserve Bank of Boston \| BIC
Borrowed funds
Amount outstanding	0
Asset Pledged as Collateral \| Federal Home Loan Bank Advances
Borrowed funds
Carrying value of the loans pledged as collateral	2,100,000	$ 2,160,000
Asset Pledged as Collateral \| Federal Home Loan Bank Advances \| FRB
Borrowed funds
Carrying value of the loans pledged as collateral	$ 362,100