What sort of special deal do you think he got here? Pretty much none as a loan against one’s life savings (in a brokerage account) is more or less automatic and even the NYTimes concluded that there was no special deal there.
His wife does work for them (not a crime so far as I know), and almost certainly has to keep her accounts with them from a compliance perspective.
Further the loan was publicly disclosed during his senate race (shown in the link below), but not put on another form. Oh, and how did the NYTimes find this huge “secret� By looking at his public disclosure forms... yeah, real scandal there.
Finally the loan was against their brokerage account (essentially risking 1/3 their life savings) in order to run as an underdog in a senate race because he thought it was the right thing to do.