(a) A federally insured credit union must require collateral commensurate with the level of risk associated with the size and type of any commercial loan. Collateral must be sufficient to ensure adequate loan balance protection along with appropriate risk sharing with the borrower and principal(s). A federally insured credit union making an unsecured loan must determine and document in the loan file that mitigating factors sufficiently offset the relevant risk.

(b) A federally insured credit union that does not require the full and unconditional personal guarantee from the principal(s) of the borrower who has a controlling interest in the borrower must determine and document in the loan file that mitigating factors sufficiently offset the relevant risk.