Short to medium term girations -really dont matter at all - if you are long on this stock (or any other stock for that matter) - provided the fundamentals are sound the end play will unfold as it should.
A recent poster stated the MM's - make money on volatility - which is absolutely right of course.
When the market has run steadily up they - the MM's will twist - turn - spin any bit of news to acheive their ends to get a pullback - particularly on stocks that they want to add to their portfolios. BNK was not alone in getting 'hit' today along with some other stocks that have had recent good runs.
If one has spare cash days like today presented an opportunity.
GLA