Answer:
Depending on the type of structure, a stock-service loan organization can be defined as a lending company, trust, or even individual that utilizes stock as remuneration for individual members of the loan association. The issuing entity may be a bank or bank-like private operation. (See http://financial-dictionary.thefreedictionary.com/savings+and+loan+association)
Another definition applies to the more recent phenomenon of lending groups or lending associations that provide consulting and investment services to pools of stock-owning member. Here the emphasis in on the consulting and investment service rendered, the latter of which is usually provided by a Registered Investment Advisor (RIA - see http://financial-dictionary.thefreedictionary.com/RIA).
This should not be confused with securities-collateralized lending such as those offered by private institutional brokers and the private wealth management desks of major banks and brokerages (See www.abnicholas.com for example).