The board of Tustin-based Sunwest Bank promoted bank president Chris Walsh to chief executive.
He replaces Glenn Gray, who resigned after six years in the post.
Sunwest is the sixth-largest bank based in Orange County, with assets of about $612 million at the end of the first quarter.
Walsh came to Sunwest in 2008 as executive vice president and chief banking officer. He was promoted to president in 2010.