We purge every July. Any account closed longer than 18 months is purged. We do this for every application - DDA, Savings, CD, Loans and CIF accounts. Our system produces a Purge Report by application listing name, account, short name, TIN, date open, date closed....and other pertinent information based on that application. These reports are in our report system, which we have access to for years and years.
We did this for a long time on DDA, SAV, Loans but we did our first CIF purge just a couple of years ago. It was huge, because we'd been doing indirect loans for many years.
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Just working here until I get my letter from Hogwarts.