BORROWINGS (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Subordinated Debt	$ 0	$ 49,980
Interest Expense, Long-term Debt	5,000	6,800	$ 4,600
Federal home loan bank unused remaining available borrowing capacity	2,600,000	2,700,000
Total Long-Term Borrowings	62,860	112,838
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	3,800,000	3,900,000
Parent Company [Member] | Subordinated Debentures [Member]
Debt Instrument [Line Items]
Subordinated Debt	50,000	50,000
Capital Trust V Preferred Securities Due in 2037 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 51,519	51,517
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired	1.48%
Central Bancorp Capital Trust I Securities Due in 2034 [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Total Long-Term Borrowings	$ 5,258	5,258
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired	2.44%
Single issuer trust preferred securities issued by banks [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, interest rate, stated rate inclusive of interest rate swap - expired	4.62%
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Federal home loan bank unused remaining available borrowing capacity	$ 2,000,000	$ 1,600,000