Bank Account not able to exported post to GL output format in 2.94 was in 2.7. It appears the Bank account field was accessable in 2.7 and in 2.94 the data is now encripted. Since the custom output formats are implmented as view it is not possible to get this data decripted.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch.