Bank can trusted but as for bitcoin is one currency that can not be trusted with the bank because they can always have their way in control of it so i really can not trust the bank over some a month of money but i trust bitcoin over all transaction of money it is fast and is very easy anywhere you can do your transaction
currently we have to trust on both banks as well as bitcoin, as most of the people are depending of banks therefore they must trust on banks, but those people who know the benefit of bitcoin they also do trust on bitcoin, hope that with the passage of time bitcoin is going to become more and and more trusted currency of the world.