Restore from iTunes does not restore app data?
Wallets and apps that store sensitive data usually store passwords/encryption keys in keychain. If the backup was not encrypted, unfortunately, only app developers may be able to help.

Also, some banking apps and wallets don't include this data in the backup and have another way of transferring accounts or passwords.

p.s. @Steve Chambers is right, you should always have an encrypted backup, even with an easy password like '12345', just to back up as mutch data as possible.