From Collins Dictionary:
-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 (bank wide, bank-wide) there are some usage examples available:
From Securities Activities of Banks :
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:
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 ...