Federal bank and thrift regulators have issued long-awaited guidance on nontraditional mortgages. And, as expected, they came down hard on underwriting practices that fail to shield borrowers from the potential for payment shock. The 45-page guidance, issued by the Federal Reserve Board, the Federal Deposit Insurance Corp. the Office of the Comptroller of the Currency, the Office of Thrift Supervision, and the National Credit Union Administration shortly before Inside B&C Lending went to press, maintains...