As used in this chapter:
1. "Credit union" means a cooperative nonprofit society incorporated for the purpose of promoting thrift among its members, and creating a source of credit for them at legitimate rates of interest for provident or productive purposes; and 2. "Paid-in and unimpaired capital and surplus" means, the balance of all paid-in share accounts and other deposits, less any loss for which no reserve has been established or which has not been charged against undivided earnings, plus the credit balance (or less the debit balance) of undivided earnings, after all losses have been provided for and net earnings or net losses have been added thereto or deducted therefrom. Reserves shall not be considered as a part of surplus.