This is the 6204th most frequent Polish word.
bankowi
"Bankowi" means "to the bank" or "for the bank" (dative form of "bank" in Polish).
Here, 'bankowi' is used in its dative form to indicate the indirect object—who receives the documents, the bank itself.
Na kolejnym spotkaniu podarowaliśmy dokumenty bankowi.
In the next meeting, we handed the documents to the bank.
In this case, 'bankowi' is again in the dative form, showing possession or association related to the bank's opinion.
Uważam, że powinniśmy przyjrzeć się dokładniej opinii bankowi.
I believe that we should examine the opinion addressed to the bank more carefully.
Now here, 'bankowi' refers to the beneficiary of the granted permission. It identifies the entity receiving the approval in the sentence.