Wells Fargo's chief financial officer says that mortgage lending overall continues to decline as rising home sales are offset by fewer refinancings. The San Francisco Business Times reports on the comments by Wells Fargo CFO Tim Sloan, who was speaking at an investors conference. Wells Fargo is the biggest player in home mortgages, making one-third of them nationwide. The San Francisco-based bank, which also is one of the biggest in Minnesota, is ending a mortgage venture with St. Louis-based…