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REPURCHASE AGREEMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jan. 02, 2025	Dec. 31, 2024
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	$ 240,367		$ 175,621
Northway Financial, Inc "NFI"
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		$ 65,500
45930
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	254,992		175,621
MBS issued or guaranteed by U.S. government-sponsored enterprises | 45930
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	217,032		161,397
CMO issued or guaranteed by U.S. government-sponsored enterprises | 45930
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	37,960		14,224
Total Collateral -Dependent Loans | 45930
Assets Sold under Agreements to Repurchase [Line Items]
Certificates of Deposit, at Carrying Value	$ 205		$ 333

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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