Credit Suisse shares slide 10% as the shine of its rescue package wears off

• Credit Suisse stock slid almost 10% Friday, pulling back after it jumped as much as 20% the previous day.
• The declines came even after the SNB agreed to loan $54 billion to the Swiss banking giant.
• DBRS Morningstar cut Credit Suisse's credit score Thursday, amid concerns it may default on its debt.

Credit Suisse shares resumed declines Friday, losing hold of the previous day's rally in a sign investors aren't convinced the embattled Swiss banking giant isn't out of the woods yet.