Smaller banks continue to lead each of the Big Four in Roy Morgan's customer satisfaction rankings for the year to date.According to the market research firm, "banks other than the Big Four" still have a clear lead with an overall 86 per cent customer satisfaction during July 2015, compared to the Big Four's customers, among whom only 81.3 per cent said they were satisfied, or better, with their bank.Nevertheless, competition among the Big Four banks for top ranking remains close, with CBA (82.3 per cent) narrowly regaining top position from the NAB for overall satisfaction. In terms of "main financial institution" customer rankings, CBA also retains top position with 84.3 per cent, closely followed by NAB (84.2 per cent), Westpac (82.4 per cent) and ANZ (82.3 per cent). It is worth noting that Bank of Melbourne (90.3 per cent satisfaction) and St George (84.5 per cent) were both clearly ahead of their Big Four parent Westpac (80.1 per cent) in the customer satisfaction rankings.Among other banks sitting outside of the Big Four, Teachers Mutual Bank remained the best performing bank overall with 95.1 per cent of its customers satisfied. Home-loan customers of the Big Four show improved satisfaction but still trail the smaller banks. Among the ten major home-loan banks, ING Direct home-loan customers have the highest satisfaction with 93.2 per cent, followed by ME Bank (90.9 per cent) and Bendigo Bank (89.3 per cent). These three banks are unique among the top ten in that their home-loan customers have higher satisfaction levels than their non-home loan customers, according to Roy Morgan's analysts. "The decline in home-loan rates, and the flexibility now offered by the major banks in regards to how customers can deal with them (ie channel selection), have been major contributors to overall satisfaction gains across the banking sector," said Norman Morris, industry communications director for Roy Morgan Research."As such, they are setting the standard for others to follow in the highly competitive home loan market," Morris said.