v3.26.1
BORROWED FUNDS - Subordinated and Junior Subordinated Borrowings (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2024
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Nov. 26, 2019
BORROWED FUNDS          
Net loans   $ 3,581,949 $ 3,571,807    
Maximum borrowing capacity     259,100 $ 521,900  
Asset Pledged as Collateral | FHLB stock          
BORROWED FUNDS          
Net loans   $ 1,000,000 $ 740,700    
Financial guarantee          
BORROWED FUNDS          
Interest rate margin   2.79%      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember      
NHTB Capital Trust II and NHTB Capital Trust III | Financial guarantee          
BORROWED FUNDS          
Debentures issued by variable interest entities   $ 20,600      
Subordinated borrowings private placement          
BORROWED FUNDS          
Principal amount of debt issued         $ 40,000
Fixed interest rate         4.63%
Interest rate margin   3.27%      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember      
Repayments of subordinated debt $ 20,000        
Outstanding subordinated debt   $ 20,000      
Acquired subordinated notes          
BORROWED FUNDS          
Principal amount of debt issued   13,000      
Fair value   $ 11,200      
Interest rate margin   4.82%      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember      
Effective interest rate   4.875%