This is the 614th most frequent Persian word.
بانکی
"بانکی" means "related to banking" or "banking" in English.
'بانکی' here describes something related to banks, specifically 'مشاور بانکی' means 'banking advisor'.
من به یک مشاور بانکی مشورت کردم.
I consulted a banking advisor.
'بانکی' in this sentence qualifies 'سیستم', making 'سیستم بانکی' which translates to 'banking system'.
سیستم بانکی کشور باید به روز شود.
The country's banking system needs to be updated.
'بانکی' is used to qualify 'اوراق', making it 'اوراق بانکی', meaning 'banking documents'.