"INTERPOL will be also involved"

As a banker you should know Interpol get involves in Criminal Cases only. They don't involve in Civil Cases.

So the question is this a Criminal case or Civil Case?

In some countries Bad Loans, Credit Card non paymmnets are classified as Civil Cases which can lead to a maximum penalty of filing Bankruptcy against the culprit only.

Bank took a risk to earn a profit and bank should know how to minimize their risks in financial dealings.