Fraud detection and compliance provider Interthinx is buying Domus System, which specializes in compliance technology for the affordable housing industry. Irvine-based Portellus has licensed its LOS, rules management system and broker portal to Irwin Home Equity, a Columbus, IN-based subsidiary of Irwin Union Bank and Trust Co. GMAC Mortgage will handle special servicing for private investment firm Radius Mortgage Capital of San Diego...