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BORROWED FUNDS - Subordinated and Junior Subordinated Borrowings (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2024	Sep. 30, 2025	Nov. 26, 2019
Financial guarantee
BORROWED FUNDS
Interest rate margin		2.79%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
NHTB Capital Trust II and NHTB Capital Trust III | Financial guarantee
BORROWED FUNDS
Debentures issued by variable interest entities		$ 20.6
Subordinated borrowings private placement
BORROWED FUNDS
Principal amount of debt issued			$ 40.0
Fixed interest rate			4.63%
Interest rate margin		3.27%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Repayments of subordinated debt	$ 20.0
Outstanding subordinated debt		$ 20.0
Acquired subordinated notes
BORROWED FUNDS
Principal amount of debt issued		13.0
Fair value		$ 11.2
Interest rate margin		4.82%
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Effective interest rate		4.875%

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