Thelagostimes gathered that Mailafia, aged 64, died on Sunday morning from an undisclosed illness.
An associate of Mailafia, John Hayab, confirmed his death to Leadership newspaper.
Apart from working with the apex bank, Dr Mailafia was a renowned Public Affairs Analyst and he was the presidential candidate of the African Democratic Congress in the 2019 presidential election.
He was also a popular public commentator who was always willing to share his view on public affairs.
The deceased who hailed from Kaduna State is survived by his wife.