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BUSINESS COMBINATIONS (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 02, 2025 USD ($) Branch loan $ / shares shares	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Business Acquisition [Line Items]
Assets		$ 6,981,522		$ 6,981,522		$ 5,805,138
Noncash Merger Related Costs		315,000
Goodwill		151,505		151,505		$ 94,697
Acquired PCD loans (Note 3)				3,071
Financing Receivable, Net Loan Accretion Attributable To Fair Value Discount		3,800		12,400
Provision for acquired non-PCD loans (Note 3)	$ 6,300			6,293
Northway Financial, Inc "NFI"
Business Acquisition [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio	0.83
Acquire amount value	$ 96,490
Common stock closing price (in dollars per share) | $ / shares	$ 42.25
Number of shares issued (in shares) | shares	2,283,782
Business Combination, Outstanding Shares Percentage	14.00%
Number of branches | Branch	17
Number Of Branches Added By Merger | loan	72
Assets		$ 7,000,000		7,000,000
Noncash Merger Related Costs			$ 727	$ 9,200	$ 727
Goodwill	$ 56,808

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