CNBC Africa's Fifi Peters puts the spotlight on Nigeria's Banking sector. Specifically, Access Bank, which is one of Nigeria's most successful turnaround stories. The bank went from being the 69th largest lender in 2002, to the 3rd biggest today. And it continues to stir things up in the sector with its various product innovations. CNBC Africa's Fifi Peters spoke with one of the leaders behind Access Bank's success, that's Herbert Wigwe, Access Bank CEO on his visit to South Africa.