Barnsley Building Society is to disappear from the High Street after being re-branded as the Yorkshire Building Society.
Six branches are to close as part of the overhaul - Cudworth, Doncaster, Mexborough, Rotherham, Wombwell and Wakefield.
Two - Barnsley and Chesterfield - will become branches of Yorkshire Building Society, with the current YBS branch in Barnsley closing.
The country’s second largest building society, behind Nationwide, said the closures largely fall where branches are less than a mile apart.
Chris Pilling, chief executive of Yorkshire Building Society, said: “Our branch network always has been, and remains, at the heart of our business, providing the face-to-face service that many of our members prefer.
“These planned changes will make us more efficient and will deliver greater long-term value to both new and existing members. They will also help us to support the changing needs of our members.”
The group merged with the Barnsley Building Society in 2008.