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BORROWED FUNDS - Subordinated and Junior Subordinated Borrowings (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Nov. 26, 2024
NHTB Capital Trust II and NHTB Capital Trust III | Financial Guarantee      
Debt Instrument [Line Items]      
Debentures issued by variable interest entities $ 20.6    
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     $ 40.0
Fixed interest rate     4.63%
Repayments of subordinated debt   $ 20.0  
Outstanding subordinated debt $ 20.0    
Subordinated borrowings private placement | SOFR      
Debt Instrument [Line Items]      
Interest rate margin 3.27%