Balances maintained that exceed the top of the penalty-free band are remunerated at the interest rate to be paid on excess balances.
Effective February 2, 1984, reserve computation and maintenance periods have been changed from weekly to bi-weekly. Series with data prior to February 2, 1984 have different values reported from one week to the next. After February 2, 1984, the value repeats for 2 consecutive weeks.
Board of Governors of the Federal Reserve System (US), Interest Rate Paid On Balances Maintained That Exceed The Top Of The Penalty-Free Band [INTRESEXCW], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/INTRESEXCW/, August 1, 2015.