Non-performing assets, which include non-performing loans and foreclosed real estate owned, totaled $13.6 million or 0.74% of total assets as of September 30, 2020 compared to $3.0 million or 0.24% of total assets as of September 30, 2019. The increase in nonperforming assets includes $9.5 million of purchased credit impaired loans resulting from the acquisition of UpState.
For the three months ended September 30, 2020, net interest income, on a fully taxable equivalent basis (fte), totaled $15,547,000, which represents an increase of $5,414,000 compared to the same period in 2019. A $493.2 million increase in average loans outstanding contributed to the increased income. Net interest margin (fte) for the 2020 period was 3.73% compared to 3.60% for the similar period in 2019. Net interest income (fte) for the nine months ended September 30, 2020 totaled $35,538,000, an increase of $5,992,000, compared to the similar period in 2019 due primarily to a higher volume of earning assets. The net interest margin (fte) year-to-date for the 2020 period was 3.51%, which equaled the 3.51% recorded in the same period of 2019. All increases reflect the benefits derived from the acquisition of UpState.
Other income for the three months ended September 30, 2020 totaled $2,072,000 compared to $1,882,000 for the similar period in 2019. The increase can be attributed to a higher level of service charges and a $149,000 increase in gains recognized on the sale of loans. For the nine months ended September 30, 2020, other income totaled $5,119,000 compared to $5,083,000 in the 2019 period.
Other expenses totaled $9,380,000 for the three months ended September 30, 2020, compared to $6,791,000 in the similar period of 2019. The higher level of expense