More and more credit unions are entering the mortgage banking arena through the creation of for-profit subsidiaries known as credit union service organizations, or CUSOs.

While credit unions still account for a small portion of the multibillion-dollar mortgage origination market (the exact volume of business they do isn't readily available), dozens of credit unions have positioned themselves over the last five years to maintain a hold on mortgage servicing and loan origination fees as well as mortgage-related insurance products like homeowners and title insurance. Some, such as Navy Federal Credit Union, rank among the country's biggest issuers of Ginnie Mae securities. [See Ginnie Mae Leaders List]

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