What do you think will happen when a bank reports a derogatory account to a CRA? Of course it has a negative impact to your score, that goes without saying.
My opinion is that first and foremost you should address the issue of "Chex Systems", I don't know if you are aware of them or not. Besides CRA's that banks report to, they have their own industry reporting system, and when they report you, and they will, you won't be able to open an account at any financial system that subscribes to them. You are a "NO-GO".
My advice is to stay on top of this and give it your focus until all lights are green again.
FICO scores on November 17, 2014 (prior to applying for and being approved my mortgage)
EX=738
EQ=735
TU=754
FICO scores on March 4, 2015 after being approved for mortgage and buying the home, the mortgage isn't yet reporting.
EX- 689 EQ- 739 TU- 739