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BORROWED FUNDS - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 30, 2004
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Outstanding amount   $ 242,568 $ 183,198
Financial Guarantee | NHTB Capital Trust II and NHTB Capital Trust III      
Debt Instrument [Line Items]      
Debentures issued by variable interest entities $ 20,600    
LIBOR | Financial Guarantee      
Debt Instrument [Line Items]      
Interest rate margin 2.79%    
Callable Advances      
Debt Instrument [Line Items]      
Outstanding amount   20,000 0
Amortizing Advances      
Debt Instrument [Line Items]      
Outstanding amount   307 316
Advances from the FHLB      
Debt Instrument [Line Items]      
Outstanding amount   182,607 123,278
Credit Facility, Secured, FHLB [Member]      
Debt Instrument [Line Items]      
Line of credit maintained   1,000  
Line of credit outstanding   0 0
Credit Facility, Secured, FRB [Member]      
Debt Instrument [Line Items]      
Line of credit maintained   71,900  
Line of credit outstanding   0 0
Credit Facility, Unsecured, Federal Funds [Member]      
Debt Instrument [Line Items]      
Line of credit maintained   50,000  
Line of credit outstanding   $ 0 $ 0