For help in understanding the requirements for MSBs,
msb.gov
has a lot of information.
Also the FFIEC Examination manual at
http://www.ffiec.gov/bsa_aml_infobase/pages_manual/manual_online.htmhas all the info you'll need. This should be your bible.
Also your state/county may have additional requirements concerning licensing, etc.
As far as the 'bank's requirements', a lot of that will depend on your policies and your risk assessment.