The largest private-owned nonbank mortgage company is trying to launch an initial public offering for an affiliated business that will use the capital to amass an investment portfolio in non-agency jumbo mortgages. Provident Mortgage Capital Associates was created by Provident Funding Associates, a privately held mortgage banker that ranked 12th in loan originations in 2011, the second largest nonbank lender in the industry. While PFA will remain privately held, it will manage operations at the publicly traded PMCA and ...