Banks immediately raise interest rates

It is very telling that when the RBA - Reserve Bank of Australia - was lowering the interest rates, the banks would never pass on the full amount. ie, The RBA would lower the rate by .25%, the banks would only pass on a reduction of .2% or .19%. They always had an excuse to hold some of the reduction back (so their profits remain high)
Yesterday the RBA raised the rate .5%, the banks immediately raise their rate the full .5%