Levels of deposits at the four Irish institutions covered by the government guarantee fell slightly during September.
This is according to new figures from the Department of Finance.
Deposits at the covered banks - AIB, Bank of Ireland and Permanent TSB - were €153 billion in September down €800m, or 0.5%, during the month.
A statement from the department said the drop was due to "business as usual outflows".
The main driver of the decrease during September was lower levels of corporate deposits and a small drop in deposit balances held in Ireland by non-bank financial institutions such as insurance companies.
Since the start of the year deposits have risen by €6.3 billion (4.3%). The rate of growth over the past 12 months is 8% which equates to €11.1 billion, though the Department notes the rate of growth has slowed down.
The usage of emergency funding from the European Central Bank by AIB, BOI and PTSB reduced by a further €400m over the month.
Eurosystem funding to the covered banks peaked at just over €93 billion in January 2011 and has since fallen by 34%, or €32 billion, to €61 billion.
