How can a state institution trade with the enemy? It is the enemy or it is not. If it is the enemy all actions which destabilise and cause harm to the facilities, resources,infrastructure, food, water energy, etc. of the enemy population serve a positive purpose. In most conflicts one focuses on the destruction of all aspects of the enemy. It is Israel's schizophrenic inability to decide if it has an enemy or peace partner that keeps the problem going. It is easier to forge a peace with a vanquished enemy, such as Germany and Japan after WWII, than an arab peace partner.
Major U.S. airlines end trophy hunter shipments after Cecil the lion outcry (Reuters)
from the article: Bank of Israel proposes that state bank fund Gaza banks