Washington Mutual was the biggest supplier of mortgage financing for loans that exceeded the Fannie/Freddie purchase limits in 2004, according to a new analysis of Home Mortgage Disclosure Act data by Geosegment Systems. WaMu captured a 9.6 percent share of the jumbo market with $67.02 billion in high-balance originations, according to the HMDA data. The analysis includes only loans reported as originations by lenders, and does not include loan purchases…