Bank Chief Seeks to Rein In Risky DealsAs the real estate market slows, some mortgage lenders are trying to prop up profits by relaxing lending standards for certain types of loans, endangering borrowers and financial institutions, a top banking regulator said yesterday. Speaking to the New York Bankers Association, John M. Reich, director of the Office of Thrift Supervision, warned that some lenders are making it too easy for unsophisticated borrowers to take on risky nontraditional mortgages that they may not fully understand. * * * But a regulatory crackdown on the loans, known as interest-only and option mortgages, could...