This series is a ratio of Net Income call item RIAD4340 to Quarterly Average of Total Assets call item RCFD3368.
Geographic location is determined by Abbreviated State Name call item RSSD9200 = "IL" representing two character state abbreviation of Illinois.
Data are annualized.
For more information and definition about the specific call item codes, please see http://www.federalreserve.gov/apps/mdrm/data-dictionary.
This series is calculated by the Federal Reserve Bank of St. Louis using raw data that are collected by the FFIEC. Raw data can be found at https://cdr.ffiec.gov/public/.
Federal Financial Institutions Examination Council (US), Return on Average Assets for Banks in Illinois [ILROA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/ILROA, May 29, 2017.