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BORROWED FUNDS - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 30, 2004
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Outstanding advances of FRB   $ 331,369 $ 94,802
Outstanding amount   62,877 83,722
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   0 20,000
Amortizing Advances      
Debt Instrument [Line Items]      
Outstanding amount   298  
FHLB advances      
Debt Instrument [Line Items]      
Outstanding amount   288  
Advances from the FHLB      
Debt Instrument [Line Items]      
Outstanding advances of FRB   318,000 75,000
Outstanding amount   2,588 23,598
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   90,400 64,700
Line of credit outstanding   0 0
Credit Facility, Unsecured, Federal Funds [Member]      
Debt Instrument [Line Items]      
Line of credit maintained   50,000 50,000
Line of credit outstanding   $ 0 $ 0