Federally-chartered banks and thrifts should conduct compliance reviews of the appraisals backing all of their mortgage originations, federal bank and thrift regulators say. The caution was issued in guidance issued last week by the Federal Financial Institutions Examination Council. The guidance, which took the form of responses to frequently asked questions, resulted from inquires that the regulatory agencies had received from lenders wanting more clarification about the existing standards for selecting, ordering, and monitoring…