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BORROWINGS (Details) - USD ($) $ in Thousands	Jan. 02, 2025	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Repurchase Agreements		$ 240,367	$ 175,621
Total short-term borrowings		748,492	500,621
Long-term borrowings		$ 1,000
Northway Financial, Inc "NFI"
Debt Instrument [Line Items]
Repurchase Agreements	$ 65,500
Junior Subordinated Debt | Subsidiary One
Debt Instrument [Line Items]
Interest rate		5.90%
Long-term Debt		$ 36,083	36,083
Proceeds from Issuance of Subordinated Long-Term Debt	$ 10,000
Debt Instrument, Basis Spread on Variable Rate	0.26161%
Debt Instrument, Basis Spread on Variable Rate, Additional	1.60%
Junior Subordinated Debt | Subsidiary Two
Debt Instrument [Line Items]
Interest rate		5.79%
Long-term Debt		$ 8,248	8,248
Proceeds from Issuance of Subordinated Long-Term Debt	$ 10,000
Debt Instrument, Basis Spread on Variable Rate	0.26161%
Debt Instrument, Basis Spread on Variable Rate, Additional	1.49%
Junior Subordinated Debt | Subsidiary Three
Debt Instrument [Line Items]
Long-term Debt		8,555	0
Junior Subordinated Debt | Subsidiary Four
Debt Instrument [Line Items]
Long-term Debt		8,555	0
Subordinated Debt and Junior Subordinated Debt
Debt Instrument [Line Items]
Long-term Debt		61,441	44,331
FHLBB and Correspondent Bank Overnight Borrowings
Debt Instrument [Line Items]
Long-term borrowings		1,000	0
Short-term Debt [Member]
Debt Instrument [Line Items]
Total short-term borrowings		748,492	500,621
Short-term Debt [Member] | Customer Repurchase Agreements
Debt Instrument [Line Items]
Repurchase Agreements		254,992	175,621
Short-term Debt [Member] | Customer Repurchase Agreements | Northway Financial, Inc "NFI"
Debt Instrument [Line Items]
Repurchase Agreements		65,500
Short-term Debt [Member] | FHLBB and Correspondent Bank Overnight Borrowings
Debt Instrument [Line Items]
FHLBB and Correspondent Bank Overnight Borrowings		$ 493,500	$ 325,000

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