v3.26.1
Document and Entity Information
Aug. 11, 2026
Cover [Abstract]  
Document Type 8-K
Document Period End Date Aug. 11, 2026
Entity Registrant Name NARRAGANSETT BANCORP, INC.
Entity Incorporation State Country Code MD
Entity File Number 333-296731
Entity Tax Identification Number 00-0000000
Entity Address Address Line 1 330 Swansea Mall Drive
Entity Address City Or Town Swansea
Entity Address State Or Province MA
Entity Address Postal Zip Code 02777
City Area Code 888
Local Phone Number 806-2872
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Amendment Flag false
Entity Central Index Key 0002138186