As used in this section [chapter]:
“Invest” includes any advance of funds to a bank service corporation, whether by the purchase of stock, the making of a loan, or otherwise, except a payment for rent earned, goods sold and delivered, or services rendered prior to the making of such payment;
“Applying bank” means a bank applying to a bank service corporation for bank services; and
“Stockholding bank” means a bank which owns stock of a bank service corporation.