v3.26.1
Document and Entity Information
12 Months Ended
Dec. 31, 2025
Document and Entity Information  
Document Type 11-K
Entity Registrant Name Seneca Bancorp, Inc.
Entity Central Index Key 0002072421
Amendment Flag false
SENECA SAVINGS 401(K) PLAN  
Document and Entity Information  
Document Type 11-K
Amendment Flag false