The business of servicing mortgages for other investors continues to prove too costly – and volatile – for some lenders. Commerce Federal Bank, based in Omaha, NE, last week announced that it is selling its $10 billion mortgage servicing rights portfolio to Wells Fargo. “The strategic decision to exit third-party mortgage servicing will further focus Commercial Federal’s business model on growing our very successful core banking franchise,” said William Fitzgerald, chairman and CEO of…