This series represents Quarterly Average of Total Assets call item RCFD3368 that has been weighted each quarter to smooth out the fluctuations.
Geographic location is determined by Abbreviated State Name call item RSSD9200 = 'IL' representing two character state abbreviation of Illinois.
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), Quarterly Weighted Average of Total Assets for Commercial Banks in Illinois [ILQWATA], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/ILQWATA, February 20, 2019.