Release: H.3 Aggregate Reserves of Depository Institutions and the Monetary Base (data not included in press release)
Series is calculated using data from the H.3 release as Total reserve balances maintained less Reserve balance requirements.
Please note though that this historical concept of "excess reserves" no longer has the same meaning following phase two of the simplification of reserves administration. For more information, see the Reserves Simplification Rule.
Federal Reserve Bank of St. Louis, Excess Reserves of Depository Institutions [EXCSRESNS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/EXCSRESNS, January 22, 2020.