Ind. Code § 28-7-1-17.5

Sec. 17.5. The credit committee or loan officer may approve a line of credit, which shall establish a signature limit. Advances in excess of the signature limit shall be permitted if security is pledged to guarantee that amount in excess of the signature limit. Advances may be granted to each member within the limits of such extension of credit. Where a line of credit has been approved, no additional loan application or statement of purpose is required, provided the aggregate unsecured obligation does not exceed the signature limit.