First, welcome to the BankersOnline threads.
Second, one of the benefits to these groups is that we try to answer the questions asked and not asked when they are applicable to the scenario.
If the person granting collateral to secure a loan is not one of the loan applicants, then they are not a customer for CIP.
The safety and soundness question not asked that should be is, "How to we know that the person signing the collateral agreement is actually that person and has the legal authority to sign the collateral agreement?" I'd hate to find out that I have an unsecured loan because the collateral agreement was signed with a forged signature of someone committing ID Theft.
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