Well, I think you can merge brand equity and service quality. Service quality was given in context of retailing. Later on it was adapted in multiple industries. You can also adapt it for banking industry.
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Abdullah, F., Suhaimi, R., Saban, G. and Hamali, J. (2011) Bank service quality (BSQ) index: an indicator of service performance, International Journal of Quality and Reliability Management, 28, 5, pp. 542-555.
Aldlaigan, A. H. and Buttle, F. A. (2002) SYSTRA-SQ: A new measure of bank service quality, International Journal of Service Industry Management, 13, 3/4, pp. 362-381.
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Baber, H. (2019). Relevance of e-SERVQUAL for determining the quality of FinTech services. International Journal of Electronic Finance, 9(4), 257-267.