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BORROWED FUNDS - Narrative (Details) - USD ($)		1 Months Ended	12 Months Ended
	Mar. 30, 2004	Apr. 30, 2008	Dec. 31, 2018	Dec. 31, 2019	Nov. 26, 2019	Oct. 29, 2014
Debt Instrument [Line Items]
Short-term debt			$ 647,894,000	$ 348,118,000
Amount			75,902,000	183,198,000
Financial Guarantee | 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					$ 40,000,000.0	$ 17,000,000.0
Fixed interest rate					4.625%	6.75%
SOFR
Debt Instrument [Line Items]
Fixed interest rate					3.27%
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
Current balance on line of credit			0	0
Short-term debt			611,683,000	303,286,000
Amount			32,929,000	123,278,000
Federal Reserve Bank Advances
Debt Instrument [Line Items]
Secured line of credit maintained				144,210,000
Short-term debt			0	0
Federal Reserve Bank Advances | Unsecured Debt
Debt Instrument [Line Items]
Secured line of credit maintained			50,000,000	50,000,000
Outstanding balance on unused unsecured federal funds line of credit			0	0
Federal Home Loan Bank Certificates and Obligations FHLB Callable Advances
Debt Instrument [Line Items]
Amount				0
Federal Home Loan Bank Certificates and Obligations FHLB Amortizing Advances
Debt Instrument [Line Items]
Amount			330,000	316,000
Subordinated borrowings
Debt Instrument [Line Items]
Amount			$ 37,973,000	$ 59,920,000
Maturity period (in years)		15 years
Principal amount of debt issued		$ 5,000,000.0			$ 700,000
Subordinated borrowings | LIBOR
Debt Instrument [Line Items]
Interest rate margin		3.45%	6.24%

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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