He was following the law exactly. His withdrawals were always under the legal limit of 10,000. That’s what got the FBI interested, and maybe a call from “a highly placed Democrat official.”
The indictment says that between 2010 and 2012 Hastert made fifteen $50,000 withdrawals of cash from bank accounts at Old Second Bank, People’s State Bank and Castle Bank and gave cash to Individual A around every six weeks.
http://www.myfoxny.com/story/29185204/dennis-haster-indicted