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BORROWED FUNDS - Subordinated and Junior Subordinated Borrowings (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Nov. 26, 2019
Debt Instrument [Line Items]        
Repayments of subordinated debt   $ 20,000    
NHTB Capital Trust II and NHTB Capital Trust III | Financial Guarantee        
Debt Instrument [Line Items]        
Debentures issued by variable interest entities $ 20,600 $ 20,600    
SOFR | Financial Guarantee        
Debt Instrument [Line Items]        
Interest rate margin   2.79%    
Subordinated borrowings private placement        
Debt Instrument [Line Items]        
Principal amount of debt issued       $ 40,000
Fixed interest rate       4.63%
Repayments of subordinated debt $ 20,000      
Debt issuance costs     $ 158  
Subordinated borrowings private placement | SOFR        
Debt Instrument [Line Items]        
Interest rate margin   3.27%