Subsequent Events	6 Months Ended
	Jun. 30, 2025
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS Effective July 1, 2025, the Company completed its merger with Enterprise Bancorp, Inc. (“Enterprise”), parent of Enterprise Bank and Trust Company (“Enterprise Bank”) pursuant to which Enterprise merged with and into the Company, with the Company as the surviving corporation, and Enterprise Bank was merged into Rockland Trust, with Rockland Trust as the surviving entity (“the acquisition”). The acquisition resulted in the addition of 27 branch locations in Massachusetts and New Hampshire and approximately $3.9 billion in loans and $4.4 billion in deposits, each at estimated fair value. As consideration for the acquisition, each Enterprise share was exchanged for 0.60 of a share of the Company’s common stock and $2.00 in cash, with cash paid in lieu of fractional shares at a price of $61.61, an amount determined by the volume-weighted average closing price of a share of the Company’s common stock for the five consecutive trading days ending on the fifth day immediately preceding the closing date of the acquisition. As a result of the acquisition, former Enterprise shareholders received, in the aggregate, approximately 7.5 million shares of the Company’s common stock and approximately $25.8 million in cash, inclusive of the payment made to cash out outstanding stock options and excluding cash paid in lieu of fractional shares.