v3.26.1
DESCRIPTION OF PLAN - Forfeited Accounts (Details) - Needham Bank 401(k) Plan - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
PLAN TERMINATION    
Forfeited unvested accounts $ 164,117 $ 119,717
Reduction in employer contribution from forfeited unvested accounts $ 116,838