Net Interest Margin for Banks Geographically Located in Federal Reserve District 8: St. Louis Portion of Illinois (DISCONTINUED) was 3.45% in July of 2020, according to the United States Federal Reserve. Historically, Net Interest Margin for Banks Geographically Located in Federal Reserve District 8: St. Louis Portion of Illinois (DISCONTINUED) reached a record high of 5.51 in January of 1994 and a record low of 3.45 in April of 2013. Trading Economics provides the current actual value, an historical data chart and related indicators for Net Interest Margin for Banks Geographically Located in Federal Reserve District 8: St. Louis Portion of Illinois (DISCONTINUED) - last updated from the United States Federal Reserve on March of 2024.