BUSINESS COMBINATIONS (Details) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended
	Sep. 10, 2024 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 09, 2024 Branch $ / shares	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Noncash Merger Related Costs		$ 727	$ 727
Assets		5,745,180	5,745,180		$ 5,714,506
Deposits		4,575,226	4,575,226		4,597,360
Loans and Leases Receivable, Net Amount		$ 4,081,315	$ 4,081,315		$ 4,061,159
Northway Financial, Inc "NFI"
Business Acquisition [Line Items]
Acquire amount value	$ 86,600
Common stock closing price (in dollars per share) | $ / shares	$ 31.46			$ 37.90
Number of branches | Branch				16
Number of shares issued (in shares) | shares	0.83
Assets	$ 7,000,000
Deposits	5,500,000
Loans and Leases Receivable, Net Amount	$ 5,100,000