Yes. Banks are obligated to know their customers, including whether they are politically influential or the family members or close business partners of a politically influential person. This obligation is based on the Act on the Prevention of Money Laundering and the Financing of Terrorism (444/2017).
A person is politically influential if he or she holds a significant public office in Finland or abroad, or has held such a position in the past year. The family members of such persons consist of their spouses, children and their spouses, and parents.