From Collins Dictionary:

***[ -wide as a suffix: ][1]***


> ***-wide*** combines with nouns to form adjectives which indicate that something exists or happens throughout the place or area that the noun refers to.

> - ...a Europe-wide conference on security and cooperation.
> - Is the problem one that's industry-wide?


> ***-wide*** also combines to form adverbs.

> - Employers want to be sure recruits understand business Europe-wide.
> - Country-wide, a total of 22 political parties are competing for the voters' allegiance.

As for [bankwide][2] (bank wide, bank-wide) there are some usage examples available: 


From [Securities Activities of Banks ][3]: 

> The aggregate percentage is “the mean of the bank's yearly ***bank-wide compensation*** percentage for the immediately preceding year and the bank's yearly bank-wide compensation percentage for the year immediately preceding that year.” A bank's yearly “bank-wide compensation...

From [SEC docket][4]:

> The “aggregate relationship-total compensation percentage" of a bank operating under ***the bankwide approach*** would be calculated in a similar manner as the “ relationship-total compensation percentage” of an account under the ...


  [1]: https://www.collinsdictionary.com/dictionary/english/wide_2
  [2]: https://books.google.com/ngrams/graph?content=bankwide%2Cbank%20wide%2C%20bank-wide&year_start=1900&year_end=2008&corpus=15&smoothing=3&share=&direct_url=t1%3B%2Cbankwide%3B%2Cc0%3B.t1%3B%2Cbank%20wide%3B%2Cc0%3B.t1%3B%2Cbank%20-%20wide%3B%2Cc0
  [3]: https://books.google.it/books?id=NlgXPmoWy-sC&pg=SA6-PA89&dq=%22bank%20wide%22&hl=en&sa=X&ved=0ahUKEwjagu39ltndAhVCBSwKHVJ2Dj4Q6AEIPDAF#v=onepage&q=%22bank%20wide%22&f=false
  [4]: https://books.google.it/books?id=B-DlF4TdW2kC&q=%22bankwide%22&dq=%22bankwide%22&hl=en&sa=X&ved=0ahUKEwjG456amNndAhUQYxoKHXLGCBwQ6AEISTAH