Credit Union Bay Health members have voted to merge with NZCU Baywide.
Credit Union Bay Health chairwoman Carol Priest said members voted "resoundingly in favour".
"This resolution follows a process of discussions between the boards of both organisations and robust due diligence, which has highlighted the mutual benefits for members coming together as one stronger entity - one that is better positioned to provide a compelling banking alternative to the members we serve," she said.
The merger sees 1800 Credit Union Bay Health (CUBH) members join 34,000 members of NZCU Baywide, giving CUBH's members access to additional banking products and further strengthening Hawke's Bay-based Baywide as the largest credit union in the country.
The Hawke's Bay Hospital CUBH office will remain open.