Hi,
Finance related placements have never been the forte of ISB. ISB majorly places its students in Consulting and IT/ITES.
Finance related profiles are offered relatively lesser to students and proportionately IB would be even lesser.
IB related profiles are offered to generally to those who either have pre-ISB experience in the domain or to those with exceptional knowledge, given that they can back it up with substantial evidence. However, there is no formal of official backing for this inference .I am saying this purely on the basis of feedback of ISB students.
Ofcourse, a lot depends on the no of companies visiting the campus in that particular year.
You can find placement related data
here.