Goldman Sachs's Marcus could boost UK savings rates per BBC News who use an odd adjective

'Long-suffering UK savers could soon see higher returns, as one of Wall Street's swankiest banks boosts its presence on this side of the Atlantic.' 

SWANKIEST - Who chose and then approved the use of that word? 

From the BBC here 

https://www.bbc.co.uk/news/business-45652906