Aldermore chief financial officer James Mack will take responsibility for the its mortgage division on an interim basis until a permanent appointment is made.
The bank confirmed to Mortgage Solutions that the change would take effect from 5 April.
Mack will replace outgoing group managing director of mortgages Charles Haresnape who announced his departure in February.
He is joining Shariah compliant investment bank Gatehouse Bank.
Mack will remain on the Board and also continue in his role as chief financial officer.
Owain Thomas is Features and Contributing Editor at Mortgage Solutions. He has previously covered the protection and mortgage industry, more recently he edited Workplace Savings and Benefits, and HRD Connect.
Owain won the Financial Healthcare Journalist of the Year (B2B) at the Headline Money Awards in 2014 and 2016. He also won the Protection Review's Journalist of the Year award in 2012.