The European Central Bank (ECB) released  the Banking Structures Report, which analyses the main structural developments in the euro area banking sector: the capacity, consolidation and concentration of banks and related changes over time. The report covers the period from 2008 to 2012 and includes indicators for the first half of 2013.

http://www.ecb.europa.eu/press/pr/date/2013/html/pr131104.en.html