All municipal securities or other investments of money of the bank permitted or provided for under this chapter shall at all times be purchased and held in fully marketable form, subject to provision for any registration in the name of the bank. All municipal securities at any time purchased, held or owned by the bank must upon delivery to the bank be accompanied by documentation including:
1. Bond opinion. Approving bond opinion;
2. Signature certification. Certification and guaranty as to signatures;
3. Litigation certification. Certification as to the absence of litigation; and
4. Other documentation. Any other or further documentation that is required from time to time in the municipal bond market.