No public officer qualified to take acknowledgments or proofs of written instruments may be disqualified for taking the acknowledgment or proof of any instrument in writing in which a bank is interested by reason of his employment, whether as officer or employee, or by reason of his stock ownership or director status in a bank so interested, and any such acknowledgments or proofs taken before July 1, 1981, are hereby validated.
SDCL 51A-1-15