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BORROWINGS (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 30, 2006	Mar. 31, 2025	Jan. 02, 2025	Dec. 31, 2024	Dec. 31, 2006
Debt Instrument [Line Items]
Repurchase Agreements		$ 242,436		$ 175,621
Total short-term borrowings		567,436		500,621
Subordinated Debt		61,290		44,331	$ 44,300
Northway Financial, Inc "NFI"
Debt Instrument [Line Items]
Repurchase Agreements			$ 65,500
Subordinated Debt		$ 20,600
Junior Subordinated Debt | Subsidiary One
Debt Instrument [Line Items]
Interest rate		6.16%
Long-term Debt		$ 36,083		36,083
Proceeds from Issuance of Subordinated Long-Term Debt		$ 10,000
Debt Instrument, Basis Spread on Variable Rate		1.60%
Junior Subordinated Debt | Subsidiary Two
Debt Instrument [Line Items]
Interest rate		6.05%
Long-term Debt		$ 8,248		8,248
Proceeds from Issuance of Subordinated Long-Term Debt	$ 10,000
Debt Instrument, Basis Spread on Variable Rate		1.49%
Junior Subordinated Debt | Subsidiary Three
Debt Instrument [Line Items]
Long-term Debt		$ 8,479		0
Junior Subordinated Debt | Subsidiary Four
Debt Instrument [Line Items]
Long-term Debt		8,480		0
Subordinated Debt and Junior Subordinated Debt
Debt Instrument [Line Items]
Long-term Debt		61,290		44,331
Short-term Debt [Member]
Debt Instrument [Line Items]
Total short-term borrowings		567,436		500,621
Short-term Debt [Member] | Customer Repurchase Agreements
Debt Instrument [Line Items]
Repurchase Agreements		242,436		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		$ 325,000		$ 325,000

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