Yorkshire Building Society has announced its interim CEO Stephen White is leaving to take up a new role with Santander, and has been replaced by Alasdair Lenman.
In another senior appointment, Robert Purdy will take up the role of interim chief finance officer, a position Mr Lenman occupied.
John Heaps, chairman of Yorkshire Building Society, said: "Alasdair Lenman has 23 years' experience in finance and has worked in financial services for 15 years, most recently as our chief finance officer.
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"He has played a leading role in the development of our existing strategy, which has yielded some of our strongest financial results in our history. The process to appoint the next permanent chief executive officer is well advanced and will conclude as planned later this year."
Mr Lenman said: "Yorkshire Building Society is enjoying its strongest trading performance in its over 150-year history. This is enabling us to reward our members with market leading savings rates and invest in the transformation of our business so we can deliver even further value to our customers.
"I look forward to supporting the society until the process for appointing a permanent chief executive officer concludes."