For Laws and Regulations of Bangladesh Bank please go through the following link:
Banking Companies Act 1991
http://bdlaws.minlaw.gov.bd/bangla_pdf_part.php?id=751

Financial Institutions Act, 1993
http://www.bangladesh-bank.org/openpdf.php

Money Laundering Prevention Act,2012
http://www.bangladesh-bank.org/openpdf.php