Cross Country Healthcare has changed its primary banking loan relationship, moving from Wells Fargo Bank to Bank of America to handle its main credit line. The Boca Raton-based nursing and health care professional staffing company (NASDAQ: CCRN) announced late Friday that it signed a three-year senior secured revolving credit facility of up to $65 million with Bank of America (NYSE: BAC) as the lead agent. That refinanced its loan of up to $75 million with Wells Fargo (NYSE: WFC) as lead agent and…