Unfortunately, many banks (at least in the UK market) seem to see IT as some kind of overhead, to be minimized in cost and/or outsourced (e.g. Lloyds outsourcing to IBM https://www.theregister.co.uk/2017/06/06/lloyds_confirms_ibm...)
Of course there are ranges of new banks (the UK has a range of challenger banks most of whom take a more tech-focused approach) to challenge the "traditional" approach, and it'll be interesting to see how that shakes out...