ACQUISITIONS (Details Textual) - USD ($)			12 Months Ended
	Jul. 01, 2025	Apr. 01, 2019	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Business Combination [Line Items]
Acquisition Related Costs			$ 39,635,000	$ 1,902,000
Goodwill			1,090,610,000	985,072,000	$ 985,072,000	$ 985,072,000
Contractual cash flows not expected to be collected			9,020,000
Provision for credit losses			65,469,000	$ 36,250,000	$ 23,250,000
Enterprise Bancorp, Inc. [Member]
Business Combination [Line Items]
Number of shares of company stock issued for each share of Central common stock (in shares)	0.60
Cash paid in lieu of fractional shares	$ 2.00
Business transaction value	503,100,000
Business combination, consideration transferred, equity interest	$ 477,200,000
Increase in acquirer outstanding shares	7,478,906
Cost of acquired entity, cash paid		$ 25,900,000
Acquisition Related Costs			39,600,000
Goodwill	$ 105,538,000
Contractual cash flows not expected to be collected	9,020,000
Provision for credit losses	$ 34,500,000
Combination of INDB and Blue Hills Bancorp, Inc. [Member]
Business Combination [Line Items]
Acquisition Related Costs			$ 47,100,000