ORS § 18.795
In addition to such rights as the garnishee may have at law or in equity, a garnishee who is a financial institution may, following delivery of a writ of garnishment to the garnishee, set off such sums as are due from the debtor at the time the writ of garnishment is delivered. A garnishee may not set off any amounts that are not otherwise due to be paid but that have been accelerated after the delivery of a writ of garnishment. Notwithstanding any other provision of ORS 18.600 to 18.850, such a garnishee shall have no obligation to remit any sums upon the garnishment that the garnishee has set off pursuant to this section. A garnishee who sets off amounts pursuant to this section shall disclose the fact and the amount of the setoff in the garnishee response required by ORS 18.680, and must certify in the response that the amount set off by the garnishee was due from the debtor to the garnishee at the time the writ was delivered.
ORS 18.795