Comparison of Operating Results for the Three Months Ended June 30, 2022 and 2021
General. Net income increased by $52,000, or 1.3%, and was $4.1 million for each of the three months ended June 30, 2022 and 2021. The increase in net income was primarily due to a $986,000 increase in net interest income and a $39,000 decrease in non-interest expense. These increases to net income were partially offset by a $927,000 decrease in non-interest income and a $46,000 reduction in the reversal of loan loss provisions.
Net Interest Income. Net interest income increased by $986,000, or 7.5%, to $14.1 million for the three months ended June 30, 2022 from $13.1 million for the three months ended June 30, 2021. Interest income increased by $615,000, or 4.2%, primarily due to an $8.8 million increase in the average balance of interest-earning assets and a 10 basis point increase in the yield on average interest-earning assets. Interest expense decreased by $371,000, or 22.2%, due to a nine basis point decrease in the cost of average interest-bearing liabilities, which was partially offset by a $16.8 million increase in the average balance of interest-bearing liabilities. The net interest rate spread and net interest margin were 2.68% and 2.72%, respectively, for the three months ended June 30, 2022, compared to 2.49% and 2.54%, respectively, for the three months ended June 30, 2021. The increase in the net interest rate spread and in the net interest margin are attributable to a 10 basis point increase in the yield of average interest-earning assets and a nine basis point decrease in the cost of average interest-bearing liabilities.
Interest Income. Interest income increased by $615,000, or 4.2%, to $15.4 million for the three months ended June 30, 2022 from $14.8 million for the three months ended June 30, 2021. Interest income on loans decreased by $958,000, or 7.9%, to $11.2 million for the three months ended June 30, 2022 from $12.1 million for the three months ended June 30, 2021. The decrease in interest income on loans occurred because of a 19 basis point decrease in the average yield and a $35.9 million, or 2.7%, decrease in the average balance of loans. The decrease in the average yield occurred as higher yielding loans were paid off and new loans with lower interest rates were added to the loan portfolio. The decrease in the average balance of loans occurred as loan repayments and loan sales exceeded new loan originations. Interest income on securities increased by $1.5 million, or 64.1%, to $3.9 million for the three months ended June 30, 2022 from $2.4 million for the three months ended June 30, 2021. The increase in interest income on securities occurred because the average balance of securities increased by $294.9 million, or 72.1%, to $704.0 million for the three months ended June 30, 2022 from $409.1 million for the three months ended June 30, 2021. The increase in the average balance of securities occurred as mortgage-backed securities were purchased to offset the decrease in interest income on our loan portfolio. This increase in the investment securities portfolio was partially offset by an 11 basis point decline in the average yield, which occurred as higher yielding securities were paid off or sold and securities with lower interest rates were purchased.
Interest Expense. Interest expense decreased by $371,000, or 22.2%, to $1.3 million for the three months ended June 30, 2022 from $1.7 million for the three months ended June 30, 2021. The decrease in interest expense occurred because interest expense on interest-bearing deposits decreased by $352,000, or 32.3%, to $738,000 for the three months ended June 30, 2022 from $1.1 million for the three months ended June 30, 2021. The decrease in interest expense on interest-bearing deposits was due to a nine basis point decrease in the average rate on interest-bearing deposits, which was partially offset by a $16.8 million, or 1.0%, increase in the average interest-bearing deposit balance. The rate paid on average interest-bearing deposits decreased to 0.18% for the three months ended June 30, 2022 from 0.27% for the three months ended June 30, 2021. The decrease in the rate paid on average interest-bearing deposits was primarily due to lower interest rates offered on savings accounts and certificates of deposit because of a decline in market rates that occurred in 2021. The rate paid on average certificates of deposit decreased to 0.78% for the three months ended June 30, 2022 from 1.11% for the three months ended June 30, 2021. The rate paid on average savings accounts decreased to 0.08% for the three months ended June 30, 2022 from 0.11% for the three months ended June 30, 2021.
Provision for Loan Losses. We recorded a reversal of loan loss provisions of $326,000 and $372,000 for the three months ended June 30, 2022 and 2021, respectively. The reversal of loan loss provisions occurred primarily due to decreases in the amount of loans in our loan payment deferral program, Hawaii’s unemployment rate and the size of our loan portfolio. The loan payment deferral program was created to assist borrowers who were experiencing financial hardship due to the COVID-19 pandemic. The provisions recorded resulted in ratios of the allowance for loan losses to total loans of 0.17% and 0.23% at June 30, 2022 and 2021, respectively. Nonaccrual loans totaled $4.0 million at June 30, 2022, or 0.31% of total loans at that date, compared to $4.2 million of nonaccrual loans at June 30, 2021, or 0.32% of