I would start with the turnkey procedures in the 1996 FFIEC Information Systems handbook. While some parts of it are somewhat outdated, it is still a good starting point for a general IT controls review.
From there, I would look at the new Information Security and Business Continunity Planning handbooks from the FFIEC. Links to these and the 1996 handbook are available
here.
Financial Institution Letters (FDIC) addressing Information Technology are available
here, and include electronic banking and other procedures and guidance. OCC and Fed have similar documents available.
http://www.auditnet.org has a number of free workprograms available, including workprograms for specific systems (Windows NT, Unix, etc.).
http://www.theiia.org/itaudit/ offers tons of articles on the subject.
Sheshunoff, AlexInformation and other industry groups offer manuals.
If IT Audit is going to be in your lap, I would also get some training from your state banking association, an industry group like
www.misti.com or
www.icba.org, etc. Further, I would look into an IT related certification such as the
CISA or the
CISSP.