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BORROWED FUNDS - Narrative (Details) - USD ($)		1 Months Ended
	Mar. 30, 2014	Apr. 30, 2008	Mar. 31, 2018	Dec. 31, 2017	Oct. 29, 2014
Debt Instrument [Line Items]
Short-term debt			$ 598,987,000	$ 649,498,000
Advances outstanding			186,229,000	180,223,000
Financial Guarantee | NHTB Capital Trust II and NHTB Capital Trust III
Debt Instrument [Line Items]
Debentures issued by variable interest entities	$ 20,600,000
Subordinated debt
Debt Instrument [Line Items]
Principal amount of debt issued					$ 17,000,000
Fixed interest rate					6.75%
LIBOR | Financial Guarantee
Debt Instrument [Line Items]
Interest rate margin	2.79%
Advances from the FHLB
Debt Instrument [Line Items]
Secured line of credit maintained			1,000,000
Short-term line of credit outstanding			0	0
Short-term debt			567,372,000	608,792,000
Advances outstanding			143,211,000	137,190,000
Federal Reserve Bank Advances
Debt Instrument [Line Items]
Secured line of credit maintained			118,000,000
Short-term debt			0	0
Federal Home Loan Bank Certificates and Obligations FHLB Callable Advances
Debt Instrument [Line Items]
Advances outstanding			25,000,000	27,000,000
Federal Home Loan Bank Certificates and Obligations FHLB Amortizing Advances
Debt Instrument [Line Items]
Advances outstanding			676,000	683,000
Subordinated borrowings
Debt Instrument [Line Items]
Advances outstanding			$ 38,018,000	$ 38,033,000
Maturity period		15 years
Principal amount of debt issued		$ 5,000,000
Earliest callable period without penalties		5 years
Effective interest rate			5.57%	5.04%
Subordinated borrowings | LIBOR
Debt Instrument [Line Items]
Interest rate margin		3.45%

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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