Fiserv Inc. of Brookfield, Wis., announced Monday that it has signed four new credit union customers for its core account processing systems, and is converting three existing customers to different core systems.

The new customers are the $73 million-asset Bluebonnet Credit Union of Houston; the $7 million-asset Menominee Area Credit Union in Michigan; the $TK million-asset Millstream Area Credit Union in Findlay, Ohio; and NCI Community Development Credit Union, a start-up in Houston.

The current Fiserv clients moving to new systems are the $31 million-asset First Castle Federal Credit Union of Covington, La.; the $78 million-asset Pasadena Service Federal Credit Union in California; and the $21 million-asset United Energy Credit Union of Houston.