The $253 million Virginia-based credit union will convert to Symitar's Episys after running on Fiserv's DataSafe for more than 20 years.
Although mergers completed in 2013 decreased from 2012, NCUA Economist John Worth said the pace hasn't changed much since 2000.
Opposing trade groups put their differences aside to join forces in a letter to Congress supporting patent troll legislation.
Three more credit unions announced their intent to change core processing platforms.
Two credit unions commit to Symitar, while a third converts from one Fiserv platform to another.
Members surveyed also reported their average Target breach cost was $45,000.
Pennsylvania credit union converting from Fiserv Advantage platform, Callahan data shows.
UltraData loses two and CU*Answers gains two clients in this core conversion wrap-up.
In advance of Monday's Senate Banking Committee hearing on data security, bank and credit union trades urge action on issue.
Bipartisan legislation would require entities, including financial institutions, retailers and federal agencies, to investigate breaches and inform consumers.